Tuesday, December 21, 2021

Apache Log4j Core: CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation

Description
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 did not protect from uncontrolled recursion from self-referential lookups. When the logging configuration uses a non-default Pattern Layout with a Context Lookup (for example, $${ctx:loginId}), attackers with control over Thread Context Map (MDC) input data can craft malicious input data that contains a recursive lookup, resulting in a StackOverflowError that will terminate the process. This is also known as a DOS (Denial of Service) attack.
Solution(s)
  • apache-log4j-core-upgrade-2_17


  • References
  • https://attackerkb.com/topics/cve-2021-45105
  • CVE - 2021-45105




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