CISA Urges Organizations to Patch Actively Exploited Zimbra XSS Vulnerability

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday announced that it has expanded its Known Exploited Vulnerabilities Catalog with a zero-day recently identified in the Zimbra email platform.

Tracked as CVE-2022-24682, the security hole was made public on February 3, when Volexity warned that attacks exploiting it had been ongoing since December 2021.

Described as a cross-site scripting (XSS) vulnerability, the issue affects version 8.8.15 and prior of the open-source email platform. According to Zimbra, roughly 200,000 organizations use its email server, including more than a thousand government and financial institutions.

On February 5, Zimbra released a patch to address the vulnerability in Zimbra 8.8.15 P30, encouraging all users to update to the most recent release to remain protected.

On February 25, CISA added the security flaw to its “Must-Patch” list, encouraging federal agencies to apply the available patch by March 11 – as per Binding Operational Directive (BOD) 22-01, agencies are given two weeks to address recent vulnerabilities that are added to the catalog.

[ READ: CISA’s ‘Must Patch’ List Puts Spotlight on Vulnerability Management Processes ]

The agency also announced that three other vulnerabilities have been added to the list, though all of them are older issues. All three affect Microsoft products.

The first of these is CVE-2017-8570, a remote code execution vulnerability in the Office suite that has been exploited in attacks for more than four years, including by the China-based threat actor tracked as KeyBoy.

Next in line is CVE-2017-0222, a memory corruption flaw in Internet Explorer that allows attackers to achieve remote code execution on a vulnerable system.

When addressing the bug in May 2017, Microsoft warned of ongoing attacks exploiting it, but provided no technical details on the observed exploitation.

In July 2017, however, the company announced patches for Windows XP to address critical vulnerabilities for which the hacking group known as the Shadow Brokers leaked exploits allegedly stolen from the NSA-linked Equation Group. CVE-2017-0222 was one of these flaws.

The fourth vulnerability CISA added to its Must-Patch list on Friday is CVE-2014-6352, a Windows Object Linking and Embedding (OLE) that was already being exploited in attacks when Microsoft patched it in November 2014.

Federal agencies have until August 25 to apply patches for these three vulnerabilities, provided they haven’t addressed them already.

Private companies have also been advised to prioritize patching of the vulnerabilities added to the Known Exploited Vulnerabilities Catalog.

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