Posts Tagged: .NET Framework


14
Jul 20

‘Wormable’ Flaw Leads July Microsoft Patches

Microsoft today released updates to plug a whopping 123 security holes in Windows and related software, including fixes for a critical, “wormable” flaw in Windows Server versions that Microsoft says is likely to be exploited soon. While this particular weakness mainly affects enterprises, July’s care package from Redmond has a little something for everyone. So if you’re a Windows (ab)user, it’s time once again to back up and patch up (preferably in that order).

Top of the heap this month in terms of outright scariness is CVE-2020-1350, which concerns a remotely exploitable bug in more or less all versions of Windows Server that attackers could use to install malicious software simply by sending a specially crafted DNS request.

Microsoft said it is not aware of reports that anyone is exploiting the weakness (yet), but the flaw has been assigned a CVSS score of 10, which translates to “easy to attack” and “likely to be exploited.”

“We consider this to be a wormable vulnerability, meaning that it has the potential to spread via malware between vulnerable computers without user interaction,” Microsoft wrote in its documentation of CVE-2020-1350. “DNS is a foundational networking component and commonly installed on Domain Controllers, so a compromise could lead to significant service interruptions and the compromise of high level domain accounts.”

CVE-2020-1350 is just the latest worry for enterprise system administrators in charge of patching dangerous bugs in widely-used software. Over the past couple of weeks, fixes for flaws with high severity ratings have been released for a broad array of software products typically used by businesses, including Citrix, F5, Juniper, Oracle and SAP. This at a time when many organizations are already short-staffed and dealing with employees working remotely thanks to the COVID-19 pandemic.

The Windows Server vulnerability isn’t the only nasty one addressed this month that malware or malcontents can use to break into systems without any help from users. A full 17 other critical flaws fixed in this release tackle security weaknesses that Microsoft assigned its most dire “critical” rating, such as in Office, Internet Exploder, SharePoint, Visual Studio, and Microsoft’s .NET Framework. Continue reading →


11
Jul 17

Adobe, Microsoft Push Critical Security Fixes

It’s Patch Tuesday, again. That is, if you run Microsoft Windows or Adobe products. Microsoft issued a dozen patch bundles to fix at least 54 security flaws in Windows and associated software. Separately, Adobe’s got a new version of its Flash Player available that addresses at least three vulnerabilities.

brokenwindowsThe updates from Microsoft concern many of the usual program groups that seem to need monthly security fixes, including Windows, Internet Explorer, Edge, Office, .NET Framework and Exchange.

According to security firm Qualys, the Windows update that is most urgent for enterprises tackles a critical bug in the Windows Search Service that could be exploited remotely via the SMB file-sharing service built into both Windows workstations and servers.

Qualys says the issue affects Windows Server 2016, 2012, 2008 R2, 2008 as well as desktop systems like Windows 10, 7 and 8.1.

“While this vulnerability can leverage SMB as an attack vector, this is not a vulnerability in SMB itself, and is not related to the recent SMB vulnerabilities leveraged by EternalBlue, WannaCry, and Petya.” Qualys notes, referring to the recent rash of ransomware attacks which leveraged similar vulnerabilities.

Other critical fixes of note in this month’s release from Microsoft include at least three vulnerabilities in Microsoft’s built-in browser — Edge or Internet Explorer depending on your version of Windows. There are at least three serious flaws in these browsers that were publicly detailed prior to today’s release, suggesting that malicious hackers may have had some advance notice on figuring out how to exploit these weaknesses.

brokenflash-aAs it is accustomed to doing on Microsoft’s Patch Tuesday, Adobe released a new version of its Flash Player browser plugin that addresses a trio of flaws in that program.

The latest update brings Flash to v. 26.0.0.137 for Windows, Mac and Linux users alike. If you have Flash installed, you should update, hobble or remove Flash as soon as possible. To see which version of Flash your browser may have installed, check out this page. Continue reading →


13
Nov 12

Microsoft Patches 19 Security Holes

Microsoft today issued six software updates to fix at least 19 security holes in Windows and other Microsoft products. Thirteen of those vulnerabilities earned a “critical” rating, which means miscreants or malicious code could leverage them to break into vulnerable systems without any help from users.

Of note in these patches is a critical update for Internet Explorer 9 that fixes three flaws in IE (these bugs do not exist in older versions of IE, according to Microsoft). Other critical updates address extremely dangerous flaws in core Windows components, such as the Windows shell and Windows Kernel; these vulnerabilities are present in nearly all supported versions of Windows.

All of the critical updates earned the most dire marks on Microsoft’s “exploitability index,” which tries assess the likelihood that attackers will devise remote code execution attacks and denial of service exploits within 30 days of a security bulletin release.

Also included among the critical patches is an update for Microsoft’s .NET Framework. I mention this one separately because in the few times I’ve had troubles after applying Windows security updates, a .NET Framework patch has always been part of the mix. My update this time around went fine (albeit a tad slowly) on a Windows 7 system, but if you experience any issues applying these patches, please leave a note in the comments section below.

Other vulnerabilities addressed in today’s update batch include flaws in Microsoft Excel and Microsoft Internet Information Services (IIS). A summary of the bulletins released today is available at this link. Wolfgang Kandek, chief technology officer at Qualys, has put together a readable blog post with some additional thoughts on the severity and relative urgency of today’s patches.

Update, 8:34 p.m.. ET: Several readers have pointed my attention to problems with a non-security update released with today’s batch: KB2750841. According to this thread, KB2750841 seems to be causing issues for users of OpenDNS. This workaround from OpenDNS forum user “gotroot” appears to have worked for most users experiencing problems.


10
Jan 12

Adobe, Microsoft Issue Critical Security Fixes

Adobe and Microsoft today each issued software fixes to tackle dangerous security flaws in their  products. If you use Acrobat, Adobe Reader or Windows, it’s time to patch.

Microsoft released seven security bulletins addressing at least eight vulnerabilities in Windows. The lone “critical” Microsoft patch addresses a pair of bugs in Windows Media Player. Microsoft warns that attackers could exploit these flaws to break into Windows systems without any help from users; the vulnerability could be triggered just by browsing to a site that hosts specially crafted video content.

Continue reading →


11
Oct 11

Critical Security Updates from Microsoft, Apple

Microsoft and Apple today released security updates to fix a slew of critical security problems in their software. Microsoft’s patch batch fixes at least 23 vulnerabilities in Windows and other Microsoft products. Apple’s update addresses more than 75 security flaws in the Windows versions of iTunes.

Nine of the 23 flaws Microsoft fixed with patches today are rated “critical,” meaning attackers could exploit them to break into vulnerable systems with little or no help from users. Eight of the nine critical bugs are in Internet Explorer. The remaining critical flaw is corrected in an update for the .NET Framework. Three of the vulnerabilities fixed with these updates were disclosed publicly prior to today, including a flaw in Windows Media Center that Microsoft believes crooks are likely to soon figure out how to reliably exploit.

The iTunes update brings the music player software to version 10.5, and is available for Microsoft systems running Windows 7, Vista, XP SP2 and later. Two new features of iTunes deserve mentioning: Apple says iPhone and iPad users who upgrade to iOS 5 when it is released later this week will be able to sync with iTunes wirelessly. More importantly from an update perspective, Apple has at long last untethered iTunes from QuickTime.

Continue reading →