Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2022-10-20. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2022-41352
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through amavis via a cpio loophole (extraction to /opt/zimbra/jetty/webapps/zimbra/public) that can lead to incorrect access to any other user accounts. Zimbra recommends pax over cpio.
Risk Assessment
The flaw allows remote upload of malicious files and potential takeover of user accounts in the Zimbra mail system. Organizations running Zimbra are exposed to mail and data compromise.
Recommendation
Install pax on the Zimbra server (amavis automatically prefers pax over cpio) and update ZCS to a patched version. Verify that cpio is not installed on the server.
Other vulnerabilities in Zimbra Collaboration (ZCS)
Original NVD description (English source)
An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through amavis via a cpio loophole (extraction to /opt/zimbra/jetty/webapps/zimbra/public) that can lead to incorrect access to any other user accounts. Zimbra recommends pax over cpio. Also, pax is in the prerequisites of Zimbra on Ubuntu; however, pax is no longer part of a default Red Hat installation after RHEL 6 (or CentOS 6). Once pax is installed, amavis automatically prefers it over cpio.