Cve20207796 | Zimbra Collaboration Suite Exclusive Full

Now, authenticated as admin via SSRF, she sends one final request through the proxy to the Zimbra mailbox port (8080):

If exploited, CVE-2020-7796 can lead to several devastating outcomes:

The impact of this vulnerability is significant. A successful exploit can allow an attacker to:

: After patching, run zmcontrol -v to confirm the patch level and monitor application logs for any unusual post-upgrade behavior.

She crafts a SOAP request to localhost:7071 asking for an auth token for admin@logi-core.local . The SSRF replies with a valid admin session key. cve20207796 zimbra collaboration suite full

Understanding CVE-2020-7796: Zimbra Collaboration Suite SSRF Vulnerability

While the specific CVE number "2020-27996" may point to a different piece of software, the underlying threat it's often associated with—the critical path traversal vulnerability in the Zimbra Collaboration Suite—is one of the most serious to face enterprise email security in recent years. This is not a complex logic flaw but a straightforward failure to validate file paths during a routine operation: extracting email attachments.

: The server essentially becomes a tool for the attacker to send requests to other systems under the guise of the trusted Zimbra server. Impact and Risk

[ Unauthenticated Attacker ] │ │ (Crafted HTTP Request with Target URL) ▼ [ Zimbra Web Server (WebEx Zimlet JSP) ] ──( Bypasses Internal Access Controls ) │ ├─────────────────────────────────┐ ▼ ▼ [ Internal Network Services ] [ Cloud Metadata Services (IMDS) ] (Extract System Configuration) (Steal API/IAM Infrastructure Tokens) The Root Cause Now, authenticated as admin via SSRF, she sends

Since the flaw resides in this specific component, disabling it or its JSP functionality can block the attack vector.

: By hitting the exposed JSP endpoint, an attacker specifies a destination IP address or hostname that is normally hidden behind a strict corporate firewall. The Zimbra server accepts the request, resolves the destination locally, fetches the internal asset, and returns the response to the attacker. Severe Exploitation Impacts

Attackers can scan internal networks that are not exposed to the public internet, mapping services and identifying further vulnerabilities.

The primary fix is to update your mail server deployment. Synacor addressed this vulnerability in and all subsequent major versions. The SSRF replies with a valid admin session key

CVE-2020-7796 Severity: High (CVSS 7.5 – 8.2 depending on configuration) Affected Software: Zimbra Collaboration Suite (ZCS) versions prior to 8.8.15.patch7 and 8.8.12.patch11. Vulnerability Type: Unrestricted Upload of File with Dangerous Type (Remote Code Execution)

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

The Cybersecurity and Infrastructure Security Agency (CISA), a division of the US Department of Defense, has issued advisories highlighting the active exploitation of these vulnerabilities by well-organized threat actors. This is not a theoretical risk; it is actively being exploited in the wild.

Zimbra Collaboration Suite < 8.8.15 Patch 7 Severity: Medium (Base Score: 6.8 according to NVD) Technical Analysis of the Vulnerability