Cve20207796 Zimbra Collaboration Suite Full [extra Quality] -

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

Further Compromise: Successful SSRF can be a gateway to stealing login credentials, injecting malware, or gaining a foothold for lateral movement within a network. Mitigation and Remediation CVE-2020-7796 Detail - NVD cve20207796 zimbra collaboration suite full

2. Root Cause Analysis – The Anatomy of the Flaw

To understand CVE-2020-27996, one must first understand how Zimbra handles proxy requests and session management. Affected Versions Zimbra Collaboration Suite (ZCS) before 8

Impact on Zimbra Collaboration Suite

| Affected Component | Consequence | |--------------------|--------------| | Webmail (Ajax & Modern UI) | Session hijacking, email theft, mass mailing from compromised accounts | | Admin Console (port 7071) | If an admin clicks the crafted link, attacker gains full server control (add accounts, change settings, execute commands via zimbraAttrs) | | Calendar sharing | Leak of calendar events, meeting invitations hijacked | | Briefcase (file storage) | Unauthorized download/upload of sensitive documents | cve20207796 zimbra collaboration suite full

By sending a specially crafted HTTP request to the vulnerable JSP file, an attacker forces the server to act as a proxy, making requests to other URLs on their behalf. Affected Versions Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 Remediation & Mitigation Administrators should prioritize the following actions: ZCS 8.8.15 Patch 7

Zimbra Collaboration Suite (ZCS) is a widely used enterprise-level email and collaboration platform. However, versions prior to 8.8.15 Patch 7 are vulnerable to a significant security flaw identified as CVE-2020-7796 What is CVE-2020-7796? CVE-2020-7796 is a Server-Side Request Forgery (SSRF)

The Missing Authentication Check

The critical oversight: The servlet endpoint that allows proxying to internal services (like the mailboxd admin port on localhost) did not enforce authentication. Even worse, certain endpoints of the servlet allowed execution of system commands via the Command or Extension functionality.