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[SECURITY] [DLA 2852-1] apache-log4j2 security update

Debian LTS Advisory DLA-2852-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Markus Koschany
December 26, 2021                             https://wiki.debian.org/LTS

Package        : apache-log4j2
Version        : 2.12.3-0+deb9u1
CVE ID         : CVE-2020-9488 CVE-2021-45105
Debian Bug     : 959450 1001891

Several security vulnerabilities were found in Apache Log4j2, a Logging
Framework for Java, which could lead to a denial of service or information


    Improper validation of certificate with host mismatch in Apache Log4j SMTP
    appender. This could allow an SMTPS connection to be intercepted by a
    man-in-the-middle attack which could leak any log messages sent through
    that appender.


    Apache Log4j2 did not protect from uncontrolled recursion from
    self-referential lookups. This allows an attacker with control over Thread
    Context Map data to cause a denial of service when a crafted string is

For Debian 9 stretch, these problems have been fixed in version

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:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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