Snort rule update for Dec. 14, 2021 — Microsoft Patch Tuesday

The latest SNORT® rule release from Cisco Talos has arrived. This new round of rules provides coverage for many of the vulnerabilities covered in Microsoft Patch Tuesday.

For more details on the vulnerabilities Microsoft disclosed this month, view all of them on Microsoft's security update page. Since our researchers are heads-down working on the Log4j vulnerability, we were not able to release a full Patch Tuesday blog post this month on the Talos site.

Here's a breakdown of this afternoon's rule release:

Shared object rules	Modified shared object rules	New rules	Modified rules
0	0	39	7

There were no changes made to the snort.conf in this release.

Microsoft Vulnerability CVE-2021-41333: A coding deficiency exists in Microsoft Windows Print Spooler that may lead to an escalation of privilege.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 58752 through 58753.

Microsoft Vulnerability CVE-2021-43207: A coding deficiency exists in Microsoft Windows Common Log File System driver that may lead to an escalation of privilege.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 58775 through 58776.

Microsoft Vulnerability CVE-2021-43226: A coding deficiency exists in Microsoft Windows Common Log File System driver that may lead to an escalation of privilege.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 58754 through 58757.

Microsoft Vulnerability CVE-2021-43233: A coding deficiency exists in Remote Desktop Client that may lead to remote code execution.

A rule to detect attacks targeting this vulnerability is included in this release and is identified with GID 1, SID 58774.

Microsoft Vulnerability CVE-2021-43883: A coding deficiency exists in Microsoft Windows Installer that may lead to an escalation of privilege.

Previously released rules will detect attacks targeting these vulnerabilities and have been updated with the appropriate reference information. They are also included in this release and are identified with GID 1, SIDs 58635 through 58636.

Talos is releasing updates to Snort 2 SIDs: 58740-58741 and new Snort 2 SIDs: 58784-58790 to address CVE-2021-44228, an RCE vulnerability in the Apache Log4j API.

Talos has also added and modified multiple rules in the file-pdf, malware-cnc, malware-other, os-windows and server-other rule sets to provide coverage for emerging threats from these technologies.

You can subscribe to Talos' newest rule detection functionality for as low as $29 a year with a personal account. Be sure and see our business pricing as well here. Make sure and stay up to date to catch the most emerging threats.