Apple & Microsoft Patch Tuesday, July 2023 Edition

July 11, 2023
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Microsoft Corp. today released software updates to quash 130 security bugs in its Windows operating systems and related software, including at least five flaws that are already seeing active exploitation. Meanwhile, Apple customers have their own zero-day woes again this month: On Monday, Apple issued (and then quickly pulled) an emergency update to fix a zero-day vulnerability that is being exploited on MacOS and iOS devices.

On July 10, Apple pushed a “Rapid Security Response” update to fix a code execution flaw in the Webkit browser component built into iOS, iPadOS, and macOS Ventura. Almost as soon as the patch went out, Apple pulled the software because it was reportedly causing problems loading certain websites. MacRumors says Apple will likely re-release the patches when the glitches have been addressed.

Launched in May, Apple’s Rapid Security Response updates are designed to address time-sensitive vulnerabilities, and this is the second month Apple has used it. July marks the sixth month this year that Apple has released updates for zero-day vulnerabilities — those that get exploited by malware or malcontents before there is an official patch available.

If you rely on Apple devices and don’t have automatic updates enabled, please take a moment to check the patch status of your various iDevices. The latest security update that includes the fix for the zero-day bug should be available in iOS/iPadOS 16.5.1, macOS 13.4.1, and Safari 16.5.2.

On the Windows side, there are at least four vulnerabilities patched this month that earned high CVSS (badness) scores and that are already being exploited in active attacks, according to Microsoft. They include CVE-2023-32049, which is a hole in Windows SmartScreen that lets malware bypass security warning prompts; and CVE-2023-35311 allows attackers to bypass security features in Microsoft Outlook.

The two other zero-day threats this month for Windows are both privilege escalation flaws. CVE-2023-32046 affects a core Windows component called MSHTML, which is used by Windows and other applications, like Office, Outlook and Skype. CVE-2023-36874 is an elevation of privilege bug in the Windows Error Reporting Service.

Many security experts expected Microsoft to address a fifth zero-day flaw — CVE-2023-36884 — a remote code execution weakness in Office and Windows.

“Surprisingly, there is no patch yet for one of the five zero-day vulnerabilities,” said Adam Barnett, lead software engineer at Rapid7. “Microsoft is actively investigating publicly disclosed vulnerability, and promises to update the advisory as soon as further guidance is available.”

Barnett notes that Microsoft links exploitation of this vulnerability with Storm-0978, the software giant’s name for a cybercriminal group based out of Russia that is identified by the broader security community as RomCom.

“Exploitation of CVE-2023-36884 may lead to installation of the eponymous RomCom trojan or other malware,” Barnett said. “[Microsoft] suggests that RomCom / Storm-0978 is operating in support of Russian intelligence operations. The same threat actor has also been associated with ransomware attacks targeting a wide array of victims.” Continue reading →

Top Suspect in 2015 Ashley Madison Hack Committed Suicide in 2014

July 7, 2023
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When the marital infidelity website AshleyMadison.com learned in July 2015 that hackers were threatening to publish data stolen from 37 million users, the company’s then-CEO Noel Biderman was quick to point the finger at an unnamed former contractor. But as a new documentary series on Hulu reveals [SPOILER ALERT!], there was just one problem with that theory: Their top suspect had killed himself more than a year before the hackers began publishing stolen user data.

The new documentary, The Ashley Madison Affair, begins airing today on Hulu in the United States and on Disney+ in the United Kingdom. The series features interviews with security experts and journalists, Ashley Madison executives, victims of the breach and jilted spouses.

The series also touches on shocking new details unearthed by KrebsOnSecurity and Jeremy Bullock, a data scientist who worked with the show’s producers at the Warner Bros. production company Wall to Wall Media. Bullock had spent many hours poring over the hundreds of thousands of emails that the Ashley Madison hackers stole from Biderman and published online in 2015.

Wall to Wall reached out in July 2022 about collaborating with Bullock after KrebsOnSecurity published A Retrospective on the 2015 Ashley Madison Breach. That piece explored how Biderman — who is Jewish — had become the target of concerted harassment campaigns by anti-Semitic and far-right groups online in the months leading up to the hack.

Whoever hacked Ashley Madison had access to all employee emails, but they only released Biderman’s messages — three years worth. Apropos of my retrospective report, Bullock found that a great many messages in Biderman’s inbox were belligerent and anti-Semitic screeds from a former Ashley Madison employee named William Brewster Harrison.

William Harrison’s employment contract with Ashley Madison parent Avid Life Media.

The messages show that Harrison was hired in March 2010 to help promote Ashley Madison online, but the messages also reveal Harrison was heavily involved in helping to create and cultivate phony female accounts on the service.

There is evidence to suggest that in 2010 Harrison was directed to harass the owner of Ashleymadisonsucks.com into closing the site or selling the domain to Ashley Madison.

Ashley Madison’s parent company — Toronto-based Avid Life Media — filed a trademark infringement complaint in 2010 that succeeded in revealing a man named Dennis Bradshaw as the owner. But after being informed that Bradshaw was not subject to Canadian trademark laws, Avid Life offered to buy AshleyMadisonSucks.com for $10,000.

When Bradshaw refused to sell the domain, he and his then-girlfriend were subject to an unrelenting campaign of online harassment and blackmail. It now appears those attacks were perpetrated by Harrison, who sent emails from different accounts at the free email service Vistomail pretending to be Bradshaw, his then-girlfriend and their friends.

[As the documentary points out, the domain AshleyMadisonSucks.com was eventually transferred to Ashley Madison, which then shrewdly used it for advertising and to help debunk theories about why its service was supposedly untrustworthy]. Continue reading →

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Who’s Behind the DomainNetworks Snail Mail Scam?

July 3, 2023
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If you’ve ever owned a domain name, the chances are good that at some point you’ve received a snail mail letter which appears to be a bill for a domain or website-related services. In reality, these misleading missives try to trick people into paying for useless services they never ordered, don’t need, and probably will never receive. Here’s a look at the most recent incarnation of this scam — DomainNetworks — and some clues about who may be behind it.

The DomainNetworks mailer may reference a domain that is or was at one point registered to your name and address. Although the letter includes the words “marketing services” in the upper right corner, the rest of the missive is deceptively designed to look like a bill for services already rendered.

DomainNetworks claims that listing your domain with their promotion services will result in increased traffic to your site. This is a dubious claim for a company that appears to be a complete fabrication, as we’ll see in a moment.  But happily, the proprietors of this enterprise were not so difficult to track down.

The website Domainnetworks[.]com says it is a business with a post office box in Hendersonville, N.C., and another address in Santa Fe, N.M. There are a few random, non-technology businesses tied to the phone number listed for the Hendersonville address, and the New Mexico address was used by several no-name web hosting companies.

However, there is little connected to these addresses and phone numbers that get us any closer to finding out who’s running Domainnetworks[.]com. And neither entity appears to be an active, official company in their supposed state of residence, at least according to each state’s Secretary of State database.

The Better Business Bureau listing for DomainNetworks gives it an “F” rating, and includes more than 100 reviews by people angry at receiving one of these scams via snail mail. Helpfully, the BBB says DomainNetworks previously operated under a different name: US Domain Authority LLC.

DomainNetworks has an “F” reputation with the Better Business Bureau.

Copies of snail mail scam letters from US Domain Authority posted online show that this entity used the domain usdomainauthority[.]com, registered in May 2022. The Usdomainauthority mailer also featured a Henderson, NC address, albeit at a different post office box.

Usdomainauthority[.]com is no longer online, and the site seems to have blocked its pages from being indexed by the Wayback Machine at archive.org. But searching on a long snippet of text from DomainNetworks[.]com about refund requests shows that this text was found on just one other active website, according to publicwww.com, a service that indexes the HTML code of existing websites and makes it searchable.

A deceptive snail mail solicitation from DomainNetwork’s previous iteration — US Domain Authority. Image: Joerussori.com

That other website is a domain registered in January 2023 called thedomainsvault[.]com, and its registration details are likewise hidden behind privacy services. Thedomainsvault’s “Frequently Asked Questions” page is quite similar to the one on the DomainNetworks website; both begin with the question of why the company is sending a mailer that looks like a bill for domain services.

Thedomainsvault[.]com includes no useful information about the entity or people who operate it; clicking the “Contact-us” link on the site brings up a page with placeholder Lorem Ipsum text, a contact form, and a phone number of 123456789.

However, searching passive DNS records at DomainTools.com for thedomainsvault[.]com shows that at some point whoever owns the domain instructed incoming email to be sent to ubsagency@gmail.com.

The first result that currently pops up when searching for “ubsagency” in Google is ubsagency[.]com, which says it belongs to a Las Vegas-based Search Engine Optimization (SEO) and digital marketing concern generically named both United Business Service and United Business Services. UBSagency’s website is hosted at the same Ann Arbor, Mich. based hosting firm (A2 Hosting Inc) as thedomainsvault[.]com.

UBSagency’s LinkedIn page says the company has offices in Vegas, Half Moon Bay, Calif., and Renton, Wash. But once again, none of the addresses listed for these offices reveal any obvious clues about who runs UBSagency. And once again, none of these entities appear to exist as official businesses in their claimed state of residence.

Searching on ubsagency@gmail.com in Constella Intelligence shows the address was used sometime before February 2019 to create an account under the name “Sammy\Sam_Alon” at the interior decorating site Houzz.com. In January 2019, Houzz acknowledged that a data breach exposed account information on an undisclosed number of customers, including user IDs, one-way encrypted passwords, IP addresses, city and ZIP codes, as well as Facebook information.

Sammy\Sam_Alon registered at Houzz using an Internet address in Huntsville, Ala. (68.35.149.206). Constella says this address was associated with the email tropicglobal@gmail.com, which also is tied to several other “Sammy” accounts at different stores online.

Constella also says a highly unique password re-used by tropicglobal@gmail.com across numerous sites was used in connection with just a few other email accounts, including shenhavgroup@gmail.com, and distributorinvoice@mail.com.

The shenhavgroup@gmail.com address was used to register a Twitter account for a Sam Orit Alon in 2013, whose account says they are affiliated with the Shenhav Group. According to DomainTools, shenhavgroup@gmail.com was responsible for registering roughly two dozen domains, including the now-defunct unitedbusinessservice[.]com. Continue reading →

Russian Cybersecurity Executive Arrested for Alleged Role in 2012 Megahacks

June 29, 2023
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Nikita Kislitsin, formerly the head of network security for one of Russia’s top cybersecurity firms, was arrested last week in Kazakhstan in response to 10-year-old hacking charges from the U.S. Department of Justice. Experts say Kislitsin’s prosecution could soon put the Kazakhstan government in a sticky diplomatic position, as the Kremlin is already signaling that it intends to block his extradition to the United States.

Nikita Kislitsin, at a security conference in Russia.

Kislitsin is accused of hacking into the now-defunct social networking site Formspring in 2012, and conspiring with another Russian man convicted of stealing tens of millions of usernames and passwords from LinkedIn and Dropbox that same year.

In March 2020, the DOJ unsealed two criminal hacking indictments against Kislitsin, who was then head of security at Group-IB, a cybersecurity company that was founded in Russia in 2003 and operated there for more than a decade before relocating to Singapore.

Prosecutors in Northern California indicted Kislitsin in 2014 for his alleged role in stealing account data from Formspring. Kislitsin also was indicted in Nevada in 2013, but the Nevada indictment does not name his alleged victim(s) in that case.

However, documents unsealed in the California case indicate Kislitsin allegedly conspired with Yevgeniy Nikulin, a Russian man convicted in 2020 of stealing 117 million usernames and passwords from Dropbox, Formspring and LinkedIn in 2012. Nikulin is currently serving a seven-year sentence in the U.S. prison system.

As first reported by Cyberscoop in 2020, a trial brief in the California investigation identified Nikulin, Kislitsin and two alleged cybercriminals — Oleg Tolstikh and Oleksandr Vitalyevich Ieremenko — as being present during a 2012 meeting at a Moscow hotel, where participants allegedly discussed starting an internet café business.

A 2010 indictment out of New Jersey accuses Ieremenko and six others with siphoning nonpublic information from the U.S. Securities & Exchange Commission (SEC) and public relations firms, and making $30 million in illegal stock trades based on the proprietary information they stole.

[The U.S. Secret Service has an outstanding $1 million reward for information leading to the arrest of Ieremenko (Александр Витальевич Еременко), who allegedly went by the hacker handles “Zl0m” and “Lamarez.”]

Kislitsin was hired by Group-IB in January 2013, nearly six months after the Formspring hack. Group-IB has since moved its headquarters to Singapore, and in April 2023 the company announced it had fully exited the Russian market.

In a statement provided to KrebsOnSecurity, Group-IB said Mr. Kislitsin is no longer an employee, and that he now works for a Russian organization called FACCT, which stands for “Fight Against Cybercrime Technologies.”

“Dmitry Volkov, co-founder and CEO, sold his stake in Group-IB’s Russia-based business to the company’s local management,” the statement reads. “The stand-alone business in Russia has been operating under the new brand FACCT ever since and will continue to operate as a separate company with no connection to Group-IB.”

FACCT says on its website that it is a “Russian developer of technologies for combating cybercrime,” and that it works with clients to fight targeted attacks, data leaks, fraud, phishing and brand abuse. In a statement published online, FACCT said Kislitsin is responsible for developing its network security business, and that he remains under temporary detention in Kazakhstan “to study the basis for extradition arrest at the request of the United States.”

“According to the information we have, the claims against Kislitsin are not related to his work at FACCT, but are related to a case more than 10 years ago when Nikita worked as a journalist and independent researcher,” FACCT wrote.

From 2006 to 2012, Kislitsin was editor-in-chief of “Hacker,” a popular Russian-language monthly magazine that includes articles on information and network security, programming, and frequently features interviews with and articles penned by notable or wanted Russian hackers.

“We are convinced that there are no legal grounds for detention on the territory of Kazakhstan,” the FACCT statement continued. “The company has hired lawyers who have been providing Nikita with all the necessary assistance since last week, and we have also sent an appeal to the Consulate General of the Russian Federation in Kazakhstan to assist in protecting our employee.”

FACCT indicated that the Kremlin has already intervened in the case, and the Russian government claims Kislitsin is wanted on criminal charges in Russia and must instead be repatriated to his homeland.

“The FACCT emphasizes that the announcement of Nikita Kislitsin on the wanted list in the territory of the Russian Federation became known only today, June 28, 6 days after the arrest in Kazakhstan,” FACCT wrote. “The company is monitoring developments.” Continue reading →

U.K. Cyber Thug “PlugwalkJoe” Gets 5 Years in Prison

June 27, 2023
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Joseph James “PlugwalkJoe” O’Connor, a 24-year-old from the United Kingdom who earned his 15 minutes of fame by participating in the July 2020 hack of Twitter, has been sentenced to five years in a U.S. prison. That may seem like harsh punishment for a brief and very public cyber joy ride. But O’Connor also pleaded guilty in a separate investigation involving a years-long spree of cyberstalking and cryptocurrency theft enabled by “SIM swapping,” a crime wherein fraudsters trick a mobile provider into diverting a customer’s phone calls and text messages to a device they control.

Joseph “PlugwalkJoe” O’Connor, in a photo from a Globe Newswire press release Sept. 02, 2020, pitching O’Connor as a cryptocurrency expert and advisor.

On July 16, 2020 — the day after some of Twitter’s most recognizable and popular users had their accounts hacked and used to tweet out a bitcoin scam —  KrebsOnSecurity observed that several social media accounts tied to O’Connor appeared to have inside knowledge of the intrusion. That story also noted that thanks to COVID-19 lockdowns at the time, O’Connor was stuck on an indefinite vacation at a popular resort in Spain.

Not long after the Twitter hack, O’Connor was quoted in The New York Times denying any involvement. “I don’t care,” O’Connor told The Times. “They can come arrest me. I would laugh at them. I haven’t done anything.”

Speaking with KrebsOnSecurity via Instagram instant message just days after the Twitter hack, PlugwalkJoe demanded that his real name be kept out of future blog posts here. After he was told that couldn’t be promised, he remarked that some people in his circle of friends had been known to hire others to deliver physical beatings on people they didn’t like.

O’Connor was still in Spain a year later when prosecutors in the Northern District of California charged him with conspiring to hack Twitter. At the same time, prosecutors in the Southern District of New York charged O’Connor with an impressive array of cyber offenses involving the exploitation of social media accounts, online extortion, cyberstalking, and the theft of cryptocurrency then valued at nearly USD $800,000.

In late April 2023, O’Connor was extradited from Spain to face charges in the United States. Two weeks later, he entered guilty pleas in both California and New York, admitting to all ten criminal charges levied against him. On June 23, O’Connor was sentenced to five years in prison.

PlugwalkJoe was part of a community that specialized in SIM-swapping victims to take over their online identities. Unauthorized SIM swapping is a scheme in which fraudsters trick or bribe employees at wireless phone companies into redirecting the target’s text messages and phone calls to a device they control.

From there, the attackers can reset the password for any of the victim’s online accounts that allow password resets via SMS. SIM swapping also lets attackers intercept one-time passwords needed for SMS-based multi-factor authentication (MFA).

O’Connor admitted to conducting SIM swapping attacks to take control over financial accounts tied to several cryptocurrency executives in May 2019, and to stealing digital currency currently valued at more than $1.6 million.

PlugwalkJoe also copped to SIM-swapping his way into the Snapchat accounts of several female celebrities and threatening to release nude photos found on their phones.

Victims who refused to give up social media accounts or submit to extortion demands were often visited with “swatting attacks,” wherein O’Connor and others would falsely report a shooting or hostage situation in the hopes of tricking police into visiting potentially lethal force on a target’s address.

Prosecutors said O’Connor even swatted and cyberstalked a 16-year-old girl, sending her nude photos and threatening to rape and/or murder her and her family. Continue reading →

SMS Phishers Harvested Phone Numbers, Shipment Data from UPS Tracking Tool

June 22, 2023
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The United Parcel Service (UPS) says fraudsters have been harvesting phone numbers and other information from its online shipment tracking tool in Canada to send highly targeted SMS phishing (a.k.a. “smishing”) messages that spoofed UPS and other top brands. The missives addressed recipients by name, included details about recent orders, and warned that those orders wouldn’t be shipped unless the customer paid an added delivery fee.

In a snail mail letter sent this month to Canadian customers, UPS Canada Ltd. said it is aware that some package recipients have received fraudulent text messages demanding payment before a package can be delivered, and that it has been working with partners in its delivery chain to try to understand how the fraud was occurring.

The recent letter from UPS about SMS phishers harvesting shipment details and phone numbers from its website.

“During that review, UPS discovered a method by which a person who searched for a particular package or misused a package look-up tool could obtain more information about the delivery, potentially including a recipient’s phone number,” the letter reads. “Because this information could be misused by third parties, including potentially in a smishing scheme, UPS has taken steps to limit access to that information.”

The written notice goes on to say UPS believes the data exposure “affected packages for a small group of shippers and some of their customers from February 1, 2022 to April 24, 2023.”

As early as April 2022, KrebsOnSecurity began receiving tips from Canadian readers who were puzzling over why they’d just received one of these SMS phishing messages that referenced information from a recent order they’d legitimately placed at an online retailer.

In March, 2023, a reader named Dylan from British Columbia wrote in to say he’d received one of these shipping fee scam messages not long after placing an order to buy gobs of building blocks directly from Lego.com. The message included his full name, phone number, and postal code, and urged him to click a link to mydeliveryfee-ups[.]info and pay a $1.55 delivery fee that was supposedly required to deliver his Legos.

“From searching the text of this phishing message, I can see that a lot of people have experienced this scam, which is more convincing because of the information the phishing text contains,” Dylan wrote. “It seems likely to me that UPS is leaking information somehow about upcoming deliveries.”

Josh is a reader who works for a company that ships products to Canada, and in early January 2023 he inquired whether there was any information about a breach at UPS Canada.

“We’ve seen many of our customers targeted with a fraudulent UPS text message scheme after placing an order,” Josh said. “A link is provided (often only after the customer responds to the text) which takes you to a captcha page, followed by a fraudulent payment collection page.”

Pivoting on the domain in the smishing message sent to Dylan shows the phishing domain shared an Internet host in Russia [91.215.85-166] with nearly two dozen other smishing related domains, including upsdelivery[.]info, legodelivery[.]info, adidascanadaltd[.]com, crocscanadafee[.]info, refw0234apple[.]info, vista-printcanada[.]info and telus-ca[.]info.

The inclusion of big-name brands in the domains of these UPS smishing campaigns suggests the perpetrators had the ability to focus their lookups on UPS customers who had recently ordered items from specific companies.

Attempts to visit these domains with a web browser failed, but loading them in a mobile device (or in my case, emulating a mobile device using a virtual machine and Developer Tools in Firefox) revealed the first stage of this smishing attack. As Josh mentioned, what first popped up was a CAPTCHA; after the visitor solved the CAPTCHA, they were taken through several more pages that requested the user’s full name, date of birth, credit card number, address, email and phone number.

A smishing website targeting Canadians who recently purchased from Adidas online. The site would only load in a mobile browser.

In April 2022, KrebsOnSecurity heard from Alex, the CEO of a technology company in Canada who asked to leave his last name out of this story. Alex reached out when he began receiving the smishing messages almost immediately after ordering two sets of Airpods directly from Apple’s website.

What puzzled Alex most was that he’d instructed Apple to send the Airpods as a gift to two different people, and less than 24 hours later the phone number he uses for his Apple account received two of the phishing messages, both of which contained salutations that included the names of the people for whom he’d bought Airpods.

“I’d put the recipient as different people on my team, but because it was my phone number on both orders I was the one getting the texts,” Alex explained. “That same day, I got text messages referring to me as two different people, neither of whom were me.” Continue reading →

Why Malware Crypting Services Deserve More Scrutiny

June 21, 2023
10 Comments

If you operate a cybercrime business that relies on disseminating malicious software, you probably also spend a good deal of time trying to disguise or “crypt” your malware so that it appears benign to antivirus and security products. In fact, the process of “crypting” malware is sufficiently complex and time-consuming that most serious cybercrooks will outsource this critical function to a handful of trusted third parties. This story explores the history and identity behind Cryptor[.]biz, a long-running crypting service that is trusted by some of the biggest names in cybercrime.

Virtually all malware that is deployed for use in data stealing at some point needs to be crypted. This highly technical, laborious process involves iteratively altering the appearance and behavior of a malicious file until it no longer sets off alarm bells when scanned by different antivirus tools.

Experienced malware purveyors understand that if they’re not continuously crypting their malware before sending it out, then a lot more of whatever digital disease they are trying to spread is going to get flagged by security tools. In short, if you are running a cybercrime enterprise and you’re not equipped to handle this crypting process yourself, you probably need to pay someone else to do it for you.

Thanks to the high demand for reliable crypting services, there are countless cybercriminals who’ve hung out their shingles as crypting service providers. However, most of these people do not appear to be very good at what they do, because most are soon out of business.

One standout is Cryptor[.]biz. This service is actually recommended by the purveyors of the RedLine information stealer malware, which is a popular and powerful malware kit that specializes in stealing victim data and is often used to lay the groundwork for ransomware attacks. Cryptor[.]biz also has been recommended to customers of the Vidar information stealer malware family (via the malware’s Telegram support channels). Continue reading →

CISA Order Highlights Persistent Risk at Network Edge

June 15, 2023
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The U.S. government agency in charge of improving the nation’s cybersecurity posture is ordering all federal agencies to take new measures to restrict access to Internet-exposed networking equipment. The directive comes amid a surge in attacks targeting previously unknown vulnerabilities in widely used security and networking appliances.

Under a new order from the Cybersecurity and Infrastructure Security Agency (CISA), federal agencies will have 14 days to respond to any reports from CISA about misconfigured or Internet-exposed networking equipment. The directive applies to any networking devices — such as firewalls, routers and load balancers — that allow remote authentication or administration.

The order requires federal departments to limit access so that only authorized users on an agency’s local or internal network can reach the management interfaces of these devices. CISA’s mandate follows a slew of recent incidents wherein attackers exploited zero-day flaws in popular networking products to conduct ransomware and cyber espionage attacks on victim organizations.

Earlier today, incident response firm Mandiant revealed that since at least October 2022, Chinese cyber spies have been exploiting a zero-day vulnerability in many email security gateway (ESG) appliances sold by California-based Barracuda Networks to hoover up email from organizations using these devices.

Barracuda was alerted to the exploitation of a zero-day in its products in mid-May, and two days later the company pushed a security update to address the flaw in all affected devices. But last week, Barracuda took the highly unusual step of offering to replace compromised ESGs, evidently in response to malware that altered the systems in such a fundamental way that they could no longer be secured remotely with software updates.

According to Mandiant, a previously unidentified Chinese hacking group was responsible for exploiting the Barracuda flaw, and appeared to be searching through victim organization email records for accounts “belonging to individuals working for a government with political or strategic interest to [China] while this victim government was participating in high-level, diplomatic meetings with other countries.”

When security experts began raising the alarm about a possible zero-day in Barracuda’s products, the Chinese hacking group altered their tactics, techniques and procedures (TTPs) in response to Barracuda’s efforts to contain and remediate the incident, Mandiant found.

Mandiant said the attackers will continue to change their tactics and malware, “especially as network defenders continue to take action against this adversary and their activity is further exposed by the infosec community.”

Meanwhile, this week we learned more details about the ongoing exploitation of a zero-day flaw in a broad range of virtual private networking (VPN) products made by Fortinet — devices many organizations rely on to facilitate remote network access for employees.

On June 11, Fortinet released a half-dozen security updates for its FortiOS firmware, including a weakness that researchers said allows an attacker to run malware on virtually any Fortinet SSL VPN appliance. The researchers found that just being able to reach the management interface for a vulnerable Fortinet SSL VPN appliance was enough to completely compromise the devices.

“This is reachable pre-authentication, on every SSL VPN appliance,” French vulnerability researcher Charles Fol tweeted. “Patch your #Fortigate.” Continue reading →

Microsoft Patch Tuesday, June 2023 Edition

June 13, 2023
29 Comments

Microsoft Corp. today released software updates to fix dozens of security vulnerabilities in its Windows operating systems and other software. This month’s relatively light patch load has another added bonus for system administrators everywhere: It appears to be the first Patch Tuesday since March 2022 that isn’t marred by the active exploitation of a zero-day vulnerability in Microsoft’s products.

June’s Patch Tuesday features updates to plug at least 70 security holes, and while none of these are reported by Microsoft as exploited in-the-wild yet, Redmond has flagged several in particular as “more likely to be exploited.”

Top of the list on that front is CVE-2023-29357, which is a “critical” bug in Microsoft SharePoint Server that can be exploited by an unauthenticated attacker on the same network. This SharePoint flaw earned a CVSS rating of 9.8 (10.0 is the most dangerous).

“An attacker able to gain admin access to an internal SharePoint server could do a lot of harm to an organization,” said Kevin Breen, director of cyber threat research at Immersive Labs. “Gaining access to sensitive and privileged documents, stealing and deleting documents as part of a ransomware attack or replacing real documents with malicious copies to further infect users in the organization.”

There are at least three other vulnerabilities fixed this month that earned a collective 9.8 CVSS score, and they all concern a widely-deployed component called the Windows Pragmatic General Multicast (PGM), which is used for delivering multicast data — such as video streaming or online gaming.

Security firm Action1 says all three bugs (CVE-2023-32015, CVE-2023-32014, and CVE-2023-29363) can be exploited over the network without requiring any privileges or user interaction, and affected systems include all versions of Windows Server 2008 and later, as well as Windows 10 and later. Continue reading →

Barracuda Urges Replacing — Not Patching — Its Email Security Gateways

June 8, 2023
41 Comments

It’s not often that a zero-day vulnerability causes a network security vendor to urge customers to physically remove and decommission an entire line of affected hardware — as opposed to just applying software updates. But experts say that is exactly what transpired this week with Barracuda Networks, as the company struggled to combat a sprawling malware threat which appears to have undermined its email security appliances in such a fundamental way that they can no longer be safely updated with software fixes.

The Barracuda Email Security Gateway (ESG) 900 appliance.

Campbell, Calif. based Barracuda said it hired incident response firm Mandiant on May 18 after receiving reports about unusual traffic originating from its Email Security Gateway (ESG) devices, which are designed to sit at the edge of an organization’s network and scan all incoming and outgoing email for malware.

On May 19, Barracuda identified that the malicious traffic was taking advantage of a previously unknown vulnerability in its ESG appliances, and on May 20 the company pushed a patch for the flaw to all affected appliances (CVE-2023-2868).

In its security advisory, Barracuda said the vulnerability existed in the Barracuda software component responsible for screening attachments for malware. More alarmingly, the company said it appears attackers first started exploiting the flaw in October 2022.

But on June 6, Barracuda suddenly began urging its ESG customers to wholesale rip out and replace — not patch — affected appliances.

“Impacted ESG appliances must be immediately replaced regardless of patch version level,” the company’s advisory warned. “Barracuda’s recommendation at this time is full replacement of the impacted ESG.”

In a statement, Barracuda said it will be providing the replacement product to impacted customers at no cost, and that not all ESG appliances were compromised.

“No other Barracuda product, including our SaaS email solutions, were impacted by this vulnerability,” the company said. “If an ESG appliance is displaying a notification in the User Interface, the ESG appliance had indicators of compromise. If no notification is displayed, we have no reason to believe that the appliance has been compromised at this time.”

Nevertheless, the statement says that “out of an abundance of caution and in furtherance of our containment strategy, we recommend impacted customers replace their compromised appliance.”

“As of June 8, 2023, approximately 5% of active ESG appliances worldwide have shown any evidence of known indicators of compromise due to the vulnerability,” the statement continues. “Despite deployment of additional patches based on known IOCs, we continue to see evidence of ongoing malware activity on a subset of the compromised appliances. Therefore, we would like customers to replace any compromised appliance with a new unaffected device.”

Rapid7‘s Caitlin Condon called this remarkable turn of events “fairly stunning,” and said there appear to be roughly 11,000 vulnerable ESG devices still connected to the Internet worldwide.

“The pivot from patch to total replacement of affected devices is fairly stunning and implies the malware the threat actors deployed somehow achieves persistence at a low enough level that even wiping the device wouldn’t eradicate attacker access,” Condon wrote. Continue reading →