Cve20207796 Zimbra Collaboration Suite Full [better] ◉

But the actual working exploit uses the ProxyServlet to access the local Mailboxd service’s admin interface, which in turn allows command execution via a crafted soap request.

While 2020 saw several high-profile vulnerabilities in Zimbra (notably CVE-2020-27988 and CVE-2020-28016), one flaw stands out for its severity and the chilling simplicity of its exploitation: . This vulnerability, rated Critical (CVSS 9.8) , allows an unauthenticated attacker to achieve full Remote Code Execution (RCE) on the underlying Zimbra server, leading to complete compromise of the email infrastructure.

In a traditional enterprise infrastructure, the mail server resides in a Demilitarized Zone (DMZ) or a public-facing cloud segment but maintains trust routes into internal corporate networks to sync with databases, active directories, and local services.

nuclei -t cves/2020/CVE-2020-7796.yaml -u https://yourcompany.com Use code with caution. 2. Log Analysis cve20207796 zimbra collaboration suite full

Review your Zimbra mailbox log files ( /opt/zimbra/log/mailbox.log ) and web server access logs. Watch for anomalous HTTP requests hitting the WebEx zimlet JSP pathways, especially those containing localized loopback addresses ( 127.0.0.1 , localhost ) or external cloud metadata IP schemas in the parameters. Remediation and Patching Strategy

(Note: The above is a generic example based on the attack pattern. The exact endpoint may vary but the principle remains the same.)

Insufficient validation of user-supplied URLs within a Zimbra application component. Technical Impact But the actual working exploit uses the ProxyServlet

Attackers use the SSRF channel to scan ports, map internal architectures, and locate hidden network resources that are shielded from the public internet.

: If immediate patching is not possible, implement network-level controls to restrict outbound connections from the Zimbra server to only necessary destinations. Monitor logs for suspicious DNS queries or outbound HTTP requests.

Server-Side Request Forgery (SSRF) / CWE-918 In a traditional enterprise infrastructure, the mail server

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: Force the server to query internal applications (such as databases or internal admin dashboards) that are shielded from the public internet.

The server can read restricted internal resources, enabling access to local metadata services, developer portals, or cloud instance endpoints (e.g., AWS IMDS endpoints).

. Given Zimbra’s widespread use as an enterprise-grade email and collaboration platform, this vulnerability represents a severe vector for network infiltration. The Cybersecurity and Infrastructure Security Agency (CISA) added this flaw to its Known Exploited Vulnerabilities (KEV) catalog , mandating strict mitigation due to active exploitation observed in the wild. Technical Overview of CVE-2020-7796

Look for the following in Zimbra logs ( /opt/zimbra/log/access_log.nginx* , mailbox.log ):