Time to Patch


12
Jun 19

Microsoft Patch Tuesday, June 2019 Edition

Microsoft on Tuesday released updates to fix 88 security vulnerabilities in its Windows operating systems and related software. The most dangerous of these include four flaws for which there is already exploit code available. There’s also a scary bug affecting all versions of Microsoft Office that can be triggered by a malicious link or attachment. And of course Adobe has its customary monthly security update for Flash Player.

Microsoft says it has so far seen no exploitation against any of the four flaws that were disclosed publicly prior to their patching this week — nor against any of the 88 bugs quashed in this month’s release. All four are privilege escalation flaws: CVE-2019-1064 and CVE-2019-1069 affect Windows 10 and later; CVE-2019-1053 and CVE-2019-0973 both affect all currently supported versions of Windows.

Most of the critical vulnerabilities — those that can be exploited by malware or miscreants to infect systems without any action on the part of the user — are present in Microsoft’s browsers Internet Explorer and Edge.

According to Allan Liska, senior solutions architect at Recorded Future, serious vulnerabilities in this month’s patch batch reside in Microsoft Word (CVE-2019-1034 and CVE-2019-1035).

“This is another memory corruption vulnerability that requires an attacker to send a specially crafted Microsoft Word document for a victim to open, alternatively an attacker could convince a victim to click on a link to a website hosting a malicious Microsoft Word document,” Liska wrote. “This vulnerability affects all versions of Microsoft Word on Windows and Mac as well as Office 365. Given that Microsoft Word Documents are a favorite exploitation tool of cybercriminals, if this vulnerability is reverse engineered it could be widely exploited.” Continue reading →


14
May 19

Microsoft Patches ‘Wormable’ Flaw in Windows XP, 7 and Windows 2003

Microsoft today is taking the unusual step of releasing security updates for unsupported but still widely-used Windows operating systems like XP and Windows 2003, citing the discovery of a “wormable” flaw that the company says could be used to fuel a fast-moving malware threat like the WannaCry ransomware attacks of 2017.

The May 2017 global malware epidemic WannaCry affected some 200,000 Windows systems in 150 countries. Source: Wikipedia.

The vulnerability (CVE-2019-0708) resides in the “remote desktop services” component built into supported versions of Windows, including Windows 7, Windows Server 2008 R2, and Windows Server 2008. It also is present in computers powered by Windows XP and Windows 2003, operating systems for which Microsoft long ago stopped shipping security updates.

Microsoft said the company has not yet observed any evidence of attacks against the dangerous security flaw, but that it is trying to head off a serious and imminent threat.

“While we have observed no exploitation of this vulnerability, it is highly likely that malicious actors will write an exploit for this vulnerability and incorporate it into their malware,” wrote Simon Pope, director of incident response for the Microsoft Security Response Center.

“This vulnerability is pre-authentication and requires no user interaction,” Pope said. “In other words, the vulnerability is ‘wormable,’ meaning that any future malware that exploits this vulnerability could propagate from vulnerable computer to vulnerable computer in a similar way as the WannaCry malware spread across the globe in 2017. It is important that affected systems are patched as quickly as possible to prevent such a scenario from happening.”

The WannaCry ransomware threat spread quickly across the world in May 2017 using a vulnerability that was particularly prevalent among systems running Windows XP and older versions of Windows. Microsoft had already released a patch for the flaw, but many older and vulnerable OSes were never updated. Europol estimated at the time that WannaCry spread to some 200,000 computers across 150 countries. Continue reading →


9
Apr 19

Patch Tuesday Lowdown, April 2019 Edition

Microsoft today released fifteen software updates to fix more than 70 unique security vulnerabilities in various flavors of its Windows operating systems and supported software, including at least two zero-day bugs. These patches apply to Windows, Internet Explorer (IE) and Edge browsers, Office, Sharepoint and Exchange. Separately, Adobe has issued security updates for Acrobat/Reader and Flash Player.

According to security firm Rapid 7, two of the vulnerabilities — CVE-2019-0803 and CVE-2019-0859 — are already being exploited in the wild. They can result in unauthorized elevation of privilege, and affect all supported versions of Windows.

“An attacker must already have local access to an affected system to use these to gain kernel-level code execution capabilities,” Rapid7 researcher Greg Wiseman observed. “However, one of the 32 Remote Code Execution (RCE) vulnerabilities patched today could potentially be used with them in an exploit chain to obtain full control of a system.”

Aside from these zero-day privilege escalation flaws, Wiseman said, it’s a fairly standard Patch Tuesday.

“Which of course still means that there are bugs that should be patched as soon as possible, such as the eight vulnerabilities classified as critical in the scripting engine used by Microsoft browsers, and CVE-2019-0822 (an RCE in Microsoft Office that can be exploited by convincing a user to open a malicious file).”

Adobe’s Patch Tuesday includes security updates for its Flash Player and AIR software,  as well as Adobe Reader and Acrobat.

Flash updates are installed along with other monthly Windows patch rollups for consumers, and auto-installed by Google Chrome, but users may need to reboot the operating system (in the case of IE/Edge) or the browser (in Chrome) for the new updates to take effect.

Adobe’s actions also sound the death knell for Adobe Shockwave Player, which has at long last reached end-of-life.

That means no more security updates for Shockwave, which has always been something of an ugly stepchild to Flash. That is to say, Shockwave never really got the security attention Flash has received but nevertheless has been just as vulnerable and often lagging months or years behind Flash in terms of updates. Continue reading →


13
Mar 19

Patch Tuesday, March 2019 Edition

Microsoft on Tuesday pushed out software updates to fix more than five dozen security vulnerabilities in its Windows operating systems, Internet Explorer, Edge, Office and Sharepoint. If you (ab)use Microsoft products, it’s time once again to start thinking about getting your patches on. Malware or bad guys can remotely exploit roughly one-quarter of the flaws fixed in today’s patch batch without any help from users.

One interesting patch from Microsoft this week comes in response to a zero-day vulnerability (CVE-2019-0797) reported by researchers at Kaspersky Lab, who discovered the bug could be (and is being) exploited to install malicious software.

Microsoft also addressed a zero day flaw (CVE-2019-0808) in Windows 7 and Windows Server 2008 that’s been abused in conjunction with a previously unknown weakness (CVE-2019-5786) in Google’s Chrome browser. A security alert from Google last week said attackers were chaining the Windows and Chrome vulnerabilities to drop malicious code onto vulnerable systems.

If you use Chrome, take a moment to make sure you have this update and that there isn’t an arrow to the right of your Chrome address bar signifying the availability of new update. If there is, close out and restart the browser; it should restore whatever windows you have open on restart. Continue reading →


12
Feb 19

Patch Tuesday, February 2019 Edition

Microsoft on Tuesday issued a bevy of patches to correct at least 70 distinct security vulnerabilities in Windows and software designed to interact with various flavors of the operating system. This month’s patch batch tackles some notable threats to enterprises — including multiple flaws that were publicly disclosed prior to Patch Tuesday. It also bundles fixes to quash threats relevant to end users, including critical updates for Adobe Flash Player and Microsoft Office, as well as a zero-day bug in Internet Explorer.

Some 20 of the flaws addressed in February’s update bundle are weaknesses labeled “critical,” meaning Microsoft believes that attackers or malware could exploit them to fully compromise systems through little or no help from users — save from convincing a user to visit a malicious or hacked Web site.

Microsoft patched a bug in Internet Exploder Explorer (CVE-2019-0676) discovered by Google that attackers already are using to target vulnerable systems. This flaw could allow malware or miscreants to check for the presence of specific files on the target’s hard drive.

Another critical vulnerability that impacts both end users and enterprises is a weakness in the Windows component responsible for assigning Internet addresses to host computers (a.k.a. “Windows DHCP client”). That flaw, CVE-2019-0626, could let an attacker execute malcode of his choice just by sending the target a specially crafted DHCP request.

At the top of the list of patch concerns mainly for companies is a publicly disclosed issue with Microsoft Exchange services (CVE-2019-0686) that could allow an attacker on the same network as the target to access the inbox of other users. Microsoft said it has not seen active exploitation of this bug yet, but considers it likely to be exploited soon. Continue reading →


9
Jan 19

Patch Tuesday, January 2019 Edition

Microsoft on Tuesday released updates to fix roughly four dozen security issues with its Windows operating systems and related software. All things considered, this first Patch Tuesday of 2019 is fairly mild, bereft as it is of any new Adobe Flash updates or zero-day exploits. But there are a few spicy bits to keep in mind. Read on for the gory details. Continue reading →


19
Dec 18

Microsoft Issues Emergency Fix for IE Zero Day

Microsoft today released an emergency software patch to plug a critical security hole in its Internet Explorer (IE) Web browser that attackers are already using to break into Windows computers.

The software giant said it learned about the weakness (CVE-2018-8653) after receiving a report from Google about a new vulnerability being used in targeted attacks.

Satnam Narang, senior research engineer at Tenable, said the vulnerability affects the following installations of IE: Internet Explorer 11 from Windows 7 to Windows 10 as well as Windows Server 2012, 2016 and 2019; IE 9 on Windows Server 2008; and IE 10 on Windows Server 2012.

“As the flaw is being actively exploited in the wild, users are urged to update their systems as soon as possible to reduce the risk of compromise,” Narang said. Continue reading →


11
Dec 18

Patch Tuesday, December 2018 Edition

Adobe and Microsoft each released updates today to tackle critical security weaknesses in their software. Microsoft’s December patch batch is relatively light, addressing more than three dozen vulnerabilities in Windows and related applications. Adobe has issued security fixes for its Acrobat and PDF Reader products, and has a patch for yet another zero-day flaw in Flash Player that is already being exploited in the wild.

At least nine of the bugs in the Microsoft patches address flaws the company deems “critical,” meaning they can be exploited by malware or ne’er-do-wells to install malicious software with little or no help from users, save for perhaps browsing to a hacked or booby-trapped site.

Microsoft patched a zero-day flaw that is already being exploited (CVE-2018-8611) and allows an attacker to elevate his privileges on a host system. The weakness, which is present on all supported versions of Windows, is tagged with the less severe “important” rating by Microsoft mainly because it requires an attacker to be logged on to the system first.

According to security firm Rapid7, other notable vulnerabilities this month are in Internet Explorer (CVE-2018-8631) and Edge (CVE-2018-8624), both of which Microsoft considers most likely to be exploited. Similarly, CVE-2018-8628 is flaw in all supported versions of PowerPoint which is also likely to be used by attackers. Continue reading →


14
Nov 18

Patch Tuesday, November 2018 Edition

Microsoft on Tuesday released 16 software updates to fix more than 60 security holes in various flavors of Windows and other Microsoft products. Adobe also has security patches available for Flash Player, Acrobat and Reader users.

As per usual, most of the critical flaws — those that can be exploited by malware or miscreants without any help from users — reside in Microsoft’s Web browsers Edge and Internet Explorer.

This week’s patch batch addresses two flaws of particular urgency: One is a zero-day vulnerability (CVE-2018-8589) that is already being exploited to compromise Windows 7 and Server 2008 systems.

The other is a publicly disclosed bug in Microsoft’s Bitlocker encryption technology (CVE-2018-8566) that could allow an attacker to get access to encrypted data. One mitigating factor with both security holes is that the attacker would need to be already logged in to the targeted system to exploit them.

Of course, if the target has Adobe Reader or Acrobat installed, it might be easier for attackers to achieve that log in. According to analysis from security vendor Qualys, there is now code publicly available that could force these two products to leak a hash of the user’s Windows password (which could then be cracked with open-source tools). A new update for Acrobat/Reader fixes this bug, and Adobe has published some mitigation suggestions as well. Continue reading →


11
Oct 18

Patch Tuesday, October 2018 Edition

Microsoft this week released software updates to fix roughly 50 security problems with various versions of its Windows operating system and related software, including one flaw that is already being exploited and another for which exploit code is publicly available.

The zero-day bug — CVE-2018-8453 — affects Windows versions 7, 8.1, 10 and Server 2008, 2012, 2016 and 2019. According to security firm Ivanti, an attacker first needs to log into the operating system, but then can exploit this vulnerability to gain administrator privileges.

Another vulnerability patched on Tuesday — CVE-2018-8423 — was publicly disclosed last month along with sample exploit code. This flaw involves a component shipped on all Windows machines and used by a number of programs, and could be exploited by getting a user to open a specially-crafted file — such as a booby-trapped Microsoft Office document.

KrebsOnSecurity has frequently suggested that Windows users wait a day or two after Microsoft releases monthly security updates before installing the fixes, with the rationale that occasionally buggy patches can cause serious headaches for users who install them before all the kinks are worked out.

This month, Microsoft briefly paused updates for Windows 10 users after many users reported losing all of the files in their “My Documents” folder. The worst part? Rolling back to previous saved versions of Windows prior to the update did not restore the files. Continue reading →