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[ CVE-2022-37042 · Published 12 Aug 2022 ]

Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability

Exploited · CISA KEV CVSS 9.8 EPSS 92%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-08-11
  • Known to be used in ransomware campaigns
  • EPSS: 92% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 9.8

[ Description ]Official description

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.

CISA: Synacor Zimbra Collaboration Suite (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 1 Sep 2022): Apply updates per vendor instructions.

[ References ]References