CVE-2022-41352

CVE-2022-41352 is an unauthenticated arbitrary file upload flaw in Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0, rooted in a path traversal weakness (CWE-22) in how the amavis mail scanner hands archives to the cpio utility. An attacker sends a specially crafted archive via email; cpio follows traversal entries and extracts attacker-controlled files into the web root at /opt/zimbra/jetty/webapps/zimbra/public. Uploaded files in that web-accessible directory can lead to remote code execution and incorrect access to other users' accounts, giving network-level attackers high impact on confidentiality, integrity, and availability (CVSS 9.8). Any ZCS 8.8.15 or 9.0 deployment that processes mail with cpio is affected, particularly on Red Hat/CentOS 7 and later where the pax utility (which Zimbra recommends as the safe alternative) is not installed by default. The flaw is actively exploited in the wild: it was added to CISA's Known Exploited Vulnerabilities Catalog on 2022-10-20 with known ransomware use, carries a 95.5% EPSS score, and public reporting ties Zimbra exploitation to campaigns including Russia-linked Sandworm/Seashell Blizzard access operations.

What to do: Apply updates per vendor instructions, and as an immediate mitigation install the pax package on the Zimbra host (amavis automatically prefers pax over cpio once it is present; note pax is not in default Red Hat installations after RHEL/CentOS 6, while it is a prerequisite on Ubuntu). Also inspect /opt/zimbra/jetty/webapps/zimbra/public for unexpected uploaded files and review mail flow logs for suspicious archive attachments, given confirmed in-the-wild and ransomware-related exploitation.