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CVE-2020-7796 is a critical Server-Side Request Forgery (SSRF) vulnerability in the Zimbra Collaboration Suite (ZCS) . It specifically affects the WebEx zimlet component and can allow an unauthenticated attacker to force the server to make unauthorized HTTP requests to internal or external systems . Vulnerability Overview CVE ID: CVE-2020-7796
This article provides a technical deep dive into the mechanics of CVE-2020-27996, how it differs from similar CVEs, proof-of-concept (PoC) analysis, and post-exploitation impact, as well as remediation strategies.
CVE-2020-7796 is a critical server-side request forgery (SSRF) vulnerability in the Zimbra Collaboration Suite (ZCS). It allows unauthenticated remote attackers to force the server to make HTTP requests to arbitrary internal or external hosts, effectively using the server as a proxy to bypass firewalls or access sensitive internal data. Vulnerability Details CVE ID: CVE-2020-7796 CVSS Score: 9.8 (Critical) Vulnerability Type: SSRF (CWE-918) cve20207796 zimbra collaboration suite full
Root Cause: Insufficient validation of user-supplied URLs within a Zimbra application component. Technical Impact
The Explosion
| Attribute | Details | |-----------|---------| | CVE ID | CVE-2020-27996 | | Affected Product | Zimbra Collaboration Suite (ZCS) | | Affected Versions | 8.8.15 prior to Patch 11, 9.0.0 prior to Patch 5 | | Component | Proxy Servlet / UserServlet | | Attack Vector | Network / HTTP | | Authentication | None required (Pre-auth RCE) | | CVSS v3 Score | 9.8 (Critical) | | Disclosure Date | November 2020 | | Exploit Maturity | Public PoC available within days of patch |
Disable the WebEx Zimlet: Since the flaw resides in this specific component, disabling it or its JSP functionality can block the attack vector. Technical Impact The Explosion 1
Verification: After patching, run zmcontrol -v to confirm the patch level and monitor application logs for any unusual post-upgrade behavior.