Cve20207796 Zimbra Collaboration — Suite Full ((full))

: Zimbra Collaboration Suite versions prior to 8.8.15 Patch 7

A successful exploit can lead to serious consequences, including:

The Zimbra Collaboration Suite is a popular open-source email and collaboration platform used by organizations worldwide. However, a recently discovered vulnerability, tracked as CVE-2020-7796, has raised concerns about the security of this platform. In this article, we will delve into the details of this vulnerability, its impact, and the measures that can be taken to mitigate its effects.

CVE-2020-7796 is a Server-Side Request Forgery (SSRF) vulnerability identified in Zimbra Collaboration Suite (ZCS) versions prior to . The flaw allows an unauthenticated remote attacker to force the Zimbra server to make HTTP requests to arbitrary internal or external hosts. cve20207796 zimbra collaboration suite full

Implement strict outbound firewall rules for the mail server to prevent it from initiating unauthorized connections to sensitive internal subnets. General Best Practices: Follow the Zimbra Security Checklist , including enabling Two-Factor Authentication (2FA) and securing interprocess communication or provide a patch management schedule for your team?

Organizations using legacy versions of Zimbra must aggressively monitor their environments to ensure this flaw hasn't been used to deposit persistence mechanisms like web shells. Zimbra-Product-Datasheet.pdf

A proof-of-concept exploit has been publicly disclosed, which demonstrates the vulnerability and the potential impact. : Zimbra Collaboration Suite versions prior to 8

The patch updates the unrar binary to a version that addresses the buffer overflow.

In some scenarios, an SSRF vulnerability can be chained with other vulnerabilities to achieve full remote code execution on the server. Remediation and Mitigation (How to Patch)

After the package installation finishes, switch to the zimbra user context and verify the system's operational patch level: su - zimbra zmcontrol -v Use code with caution. 2. Implement Immediate Temporary Mitigations General Best Practices: Follow the Zimbra Security Checklist

: Read data leaked from local ports or internal services that trust local server IP addresses explicitly. ⚙️ Impact Assessment

If upgrading is not immediately possible, administrators should disable the affected WebEx Zimlet to mitigate the risk. Conclusion

Configure a strong CSP header on your web server. A well-configured CSP can block the execution of unauthorized inline scripts, providing a "safety net" even if an XSS vulnerability exists. 4. Monitor Logs