Critical Security Vulnerability in Apache Log4j (CVE-2021-45046) Affecting WebAPI

[djogopatrao]

We have detected a critical security vulnerability (CVE-2021-45046) in Apache Log4j components used by WebAPI. This vulnerability allows attackers to exploit incomplete fixes for CVE-2021-44228 in certain non-default configurations, potentially leading to Remote Code Execution (RCE) and information disclosure.

Details:

• CVE: CVE-2021-45046
• Severity: Critical
• Affected Components: log4j-core versions:
  • 2.2 (WEBAPI 2.14.0 uses this version)
  • 2.13.3
  • 2.14.0
• Exploit Availability: Confirmed

Description:

The fix for CVE-2021-44228 in Log4j 2.15.0 was incomplete. Attackers can manipulate Thread Context Map (MDC) input data when logging configuration uses non-default Pattern Layout with Context Lookup (e.g., $ {ctx:loginId}) or Thread Context Map patterns (%X, %mdc, %MDC). This can result in malicious JNDI lookups, leading to RCE or sensitive data leaks.

Recommended Fix:

• Upgrade to patched versions:
  • 2.12.2
  • 2.16.0 (or higher)