Security News: Microsoft Patch Tuesday September 2021, OMIGOD, MSHTML RCE, Confluence RCE, Ghostscript RCE, FORCEDENTRY Pegasus

Hello everyone! This time, let’s talk about recent vulnerabilities. I’ll start with Microsoft Patch Tuesday for September 2021. I created a report using my Vulristics tool. You can see the full report here.

The most interesting thing about the September Patch Tuesday is that the top 3 VM vendors ignored almost all RCEs in their reviews. However, there were interesting RCEs in the Office products. And what is most unforgivable is that they did not mention CVE-2021-38647 RCE in OMI – Open Management Infrastructure. Only ZDI wrote about this.

Microsoft Patch Tuesday September 2021


Dubbed “OMIGOD” by researchers at, the bugs could enable a remote attacker to gain root access to Linux virtual machines running on Azure. “We conservatively estimate that thousands of Azure customers and millions of endpoints are affected. In a small sample of Azure tenants we analyzed, over 65% were unknowingly at risk,” the firm warned.

So, OMIGOD RCEs and EOPs with detected exploitation in the wild are in the Vulristics TOP. What else?

Chrome/Chromium/Edge RCE

An exploitation in the wild has been seen for Chrome/Chromium/Edge vulnerability CVE-2021-30632. Still no comments from the VM vendors, only from ZDI.

WLAN AutoConfig RCE

Only Qualys and ZDI mentioned CVE-2021-36965 Remote Code Execution in Windows WLAN AutoConfig Service. “This would be highly useful in a coffee shop scenario where multiple people are using an unsecured WiFi network.”

Also note several EOPs in Windows Kernel, Windows Common Log File System Driver and Windows Print Spooler.


But of course, people were mostly waiting for fixes for a vulnerability that wasn’t released on Patch Tuesday, but a week ago. However, the updates only became available on September 14th. It is CVE-2021-40444 Microsoft MSHTML Remote Code Execution Vulnerability. “А critical zero-day RCE vulnerability in Microsoft’s MSHTML (Trident) engine that was exploited in the wild in limited, targeted attacks”. “To exploit this vulnerability, an attacker would need to create a specially crafted Microsoft Office document containing a malicious ActiveX control”. Well, people are saying that ActiveX is not being used in new exploits for this vulnerability. This is serious, consider this in your anti-phishing programs and, of course, install patches.

Non-Microsoft vulnerabilities

I would also like to say a few words about other recent non-Microsoft vulnerabilities.

Confluence RCE

I would like to mention the massively exploited CVE-2021-26084 Confluence RCE. A week passed between the release of the newsletter and the public exploit. If your organization has Confluence, keep an eye on it and never make it available at the perimeter of your network.

Ghostscript RCE

Also, the “Ghostscript provider Artifex Software released a security advisory regarding a vulnerability (CVE-2021-3781) that allows arbitrary command execution in Ghostscript. On a server running Ghostscript, an attacker may execute arbitrary commands by processing content that exploits this vulnerability”. There is a public exploit for this vulnerability. Ask your developers if they use it to process SVG files.


And finally the RCE CVE-2021-30860 FORCEDENTRY vulnerability that was used in Pegasus spyware. The exploit that was spotted in the wild relies on malicious PDF files. The vulnerability became famous mainly because of iPhone attacks, but there are also patches for macOS Big Sur 11.6 and 2021-005 Catalina.

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