CVE-2020-7796 represents a critical security vulnerability discovered in the Zimbra Collaboration Suite (ZCS), a popular email and collaboration platform used widely by enterprises and governments. This flaw allows an unauthenticated remote attacker to upload arbitrary files to the server. In specific configurations, this can lead to Remote Code Execution (RCE), granting the attacker full control over the mail server and access to sensitive email data.
: SSRF can be used to scan internal networks, steal sensitive metadata, or access configuration files. No Authentication Required
Further technical details and patch instructions can be found on the NVD Detail Page and the Red Hat Customer Portal . CVE-2020-7796 Detail - NVD
| Affected Component | Consequence | |--------------------|--------------| | | 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 |
Shodan searches at the time revealed over 150,000 exposed Zimbra instances, with approximately 30% still unpatched three months after the patch was released.
CVE-2020-7796 serves as a stark reminder of the risks associated with complex enterprise collaboration suites. The combination of an unrestricted upload feature and improper access controls created a "full" compromise scenario for thousands of mail servers. For organizations using Zimbra, continuous patching and rigorous monitoring of web directories remain the most effective defenses against such vulnerabilities.
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