Summary

Security Advisory ID : BSA-2021-1655

Component : Apache Log4j StrSubstitutor

Revision : 1.0

Apache Log4j2 versions 2.0-alpha1 through 2.16.0, excluding 2.12.3, 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.

More information is available at the links below.

Apache : https://logging.apache.org/log4j/2.x/security.html
ZDI: https://www.zerodayinitiative.com/blog/2021/12/17/cve-2021-45105-denial-of-service-via-uncontrolled-recursion-in-log4j-strsubstitutor

Brocade has investigated its product line to determine the exposure of Brocade Fibre Channel products from Broadcom.

Products Confirmed Not Vulnerable

No Brocade Fibre Channel Products from Broadcom products are currently known to be affected by this vulnerability.

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Revision History

Version	Change	Date
1.0	Initial Publication	December 21, 2021