Colin Mc Hugo

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Colin Mc Hugo
Security Engineer Manager & CEO at Quantum Infinite Solutions Group Ltd.

Microsoft Issues Patches for In-the-Wild 0-day and 55 Others Windows Bugs

February 10, 2021

Microsoft on Tuesday issued fixes for 56 flaws, together with a important vulnerability that is identified to be actively exploited within the wild.

In all, 11 are listed as Essential, 43 are listed as Vital, and two are listed as Reasonable in severity — six of that are beforehand disclosed vulnerabilities.

The updates cowl .NET Framework, Azure IoT, Microsoft Dynamics, Microsoft Edge for Android, Microsoft Alternate Server, Microsoft Workplace, Microsoft Home windows Codecs Library, Skype for Enterprise, Visible Studio, Home windows Defender, and different core parts similar to Kernel, TCP/IP, Print Spooler, and Distant Process Name (RPC).

A Home windows Win32k Privilege Escalation Vulnerability

Probably the most important of the failings is a Home windows Win32k privilege escalation vulnerability (CVE-2021-1732, CVSS rating 7.8) that permits attackers with entry to a goal system to run malicious code with elevated permissions. Microsoft credited JinQuan, MaDongZe, TuXiaoYi, and LiHao of DBAPPSecurity for locating and reporting the vulnerability.

password auditor

In a separate technical write-up, the researchers mentioned a zero-day exploit leveraging the flaw was detected in a “very restricted variety of assaults” in opposition to victims situated in China by a risk actor named Bitter APT. The assaults have been found in December 2020.

“This zero-day is a brand new vulnerability which brought on by win32k callback, it might be used to flee the sandbox of Microsoft [Internet Explorer] browser or Adobe Reader on the most recent Home windows 10 model,” DBAPPSecurity researchers said. “The vulnerability is top of the range and the exploit is subtle.”

It is value noting that Adobe, as a part of its February patch, addressed a important buffer overflow flaw in Adobe Acrobat and Reader for Home windows and macOS (CVE-2021-21017) that it mentioned might result in arbitrary code execution within the context of the present person.

The corporate additionally warned of energetic exploitation makes an attempt in opposition to the bug within the wild in restricted assaults concentrating on Adobe Reader customers on Home windows, mirroring aforementioned findings from DBAPPSecurity.

Whereas neither Microsoft nor Adobe has supplied further particulars, the concurrent patching of the 2 flaws raises the likelihood that the vulnerabilities are being chained to hold out the in-the-wild assaults.

Netlogon Enforcement Mode Goes Into Impact

Microsoft’s Patch Tuesday replace additionally resolves a lot of distant code execution (RCE) flaws in Home windows DNS Server (CVE-2021-24078), .NET Core, and Visible Studio (CVE-2021-26701), Microsoft Home windows Codecs Library (CVE-2021-24081), and Fax Service (CVE-2021-1722 and CVE-2021-24077).

The RCE in Home windows DNS server element is rated 9.8 for severity, making it a important vulnerability that, if left unpatched, might allow an unauthorized adversary to execute arbitrary code and doubtlessly redirect professional site visitors to malicious servers.

Microsoft can also be taking this month to push the second spherical of fixes for the Zerologon flaw (CVE-2020-1472) that was initially resolved in August 2020, following which reports of active exploitation concentrating on unpatched programs emerged in September 2020.

Beginning February 9, the area controller “enforcement mode” might be enabled by default, thus blocking “susceptible [Netlogon] connections from non-compliant gadgets.”

As well as, the Patch Tuesday replace rectifies a bug in Edge browser for Android (CVE-2021-24100) that would disclose personally identifiable data and fee data of a person.

RCE Flaws in Home windows TCP/IP Stack

Lastly, the Home windows maker launched a set of fixes affecting its TCP/IP implementation — consisting of two RCE flaws (CVE-2021-24074 and CVE-2021-24094) and one denial of service vulnerability (CVE-2021-24086) — that it mentioned might be exploited with a DoS assault.

“The DoS exploits for these CVEs would enable a distant attacker to trigger a cease error,” Microsoft said in an advisory. “Prospects may obtain a blue display on any Home windows system that’s immediately uncovered to the web with minimal community site visitors. Thus, we advocate prospects transfer shortly to use Home windows safety updates this month.”

The tech big, nevertheless, famous that the complexity of the 2 TCP/IP RCE flaws would make it arduous to develop useful exploits. But it surely expects attackers to create DoS exploits way more simply, turning the safety weak point into a really perfect candidate for exploitation within the wild.

To put in the most recent safety updates, Home windows customers can head to Begin > Settings > Replace & Safety > Home windows Replace or by deciding on Test for Home windows updates.

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