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FortiGuard Labs is aware of reports that a vulnerability affecting Zimbra Collaboration Suite (CVE-2022-41352) is a newly reported zero-day and is being exploited in the wild. CVE-2022-41352 is a Remote Code Execution (RCE) vulnerability that allows an attacker to perform remote code execution on vulnerable servers.Why is this Significant?This is significant because CVE-2022-41352 is a remote code execution vulnerability which is a zero-day and is actively being exploited in the wild.Zimbra Collaboration, formerly known as Zimbra Collaboration Suite, is a cloud-based email, calendaring, and groupware solution developed by Synacor and is widely used worldwide. According to its Web site, Zimbra is used in more than 140 countries and over 1,000 government and financial institutions.What is CVE-2022-41352?The vulnerability exists due to Amavis’ (Zimbra’s Anti-virus engine) usage of “cpio” to extract archives in emails and scan contents. By leveraging the vulnerability, an attacker can gain improper access to any other Zimbra user accounts, which can lead to remote code execution.What is the CVSS Score?CVE-2022-41352 has a CVSS rating of 9.8. Zimbra rates the vulnerability as “major”.How Widespread is this?While we do not know how widespread this is, the first report of this vulnerability being exploited has been reported to be around the beginning of September 2022.What Versions of Zimbra Collaboration Suite are Vulnerable to CVE-2022-41352?Zimbra Collaboration Suite version 8.8.15 and 9.0 are vulnerable.Has the Vendor Released a Patch for CVE-2022-41352?Yes, the vendor released a patch on October 10, 2022.What is the Status of Protection?FortiGuard Labs released the following IPS signature for CVE-2022-41352:Zimbra.Collaboration.Suite.cpio.Remote.Code.Execution (default action is set to “pass”)Any Suggested Mitigation?As mitigation, Zimbra recommends installing the pax package, an utility for creating and extracting archive files, to Zimbra servers. For details, please refer to the Appendix for a link to “Security Update – make sure to install pax/spax”.

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