Debian Security Advisory

DSA-5024-1 apache-log4j2 -- security update

Date Reported:
18 Dec 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 1001891.
In Mitre's CVE dictionary: CVE-2021-45105.
More information:

It was found that Apache Log4j2, a Logging Framework for Java, 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 denial of service.

For the oldstable distribution (buster), this problem has been fixed in version 2.17.0-1~deb10u1.

For the stable distribution (bullseye), this problem has been fixed in version 2.17.0-1~deb11u1.

We recommend that you upgrade your apache-log4j2 packages.

For the detailed security status of apache-log4j2 please refer to its security tracker page at: