Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2022-08-11. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2022-37042
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.
Risk Assessment
An unauthenticated attacker can achieve remote code execution, potentially leading to full compromise of the mail server and user data.
Recommendation
Apply the latest Zimbra patches that fully address CVE-2022-27925 and CVE-2022-37042.
Original NVD description (English source)
Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.