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Debian LTS Advisory DLA-3624-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                           Chris Lamb
October 20, 2023                              https://wiki.debian.org/LTS
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Package        : zookeeper
Version        : 3.4.13-2+deb10u1
CVE ID         : CVE-2023-44981
Debian Bug     : 1054224

It was discovered that there was a potential authorisation bypass
vulnerability in Apache Zookeeper, a co-ordination service for
reliable distributed applications.

Specifically, if SASL Quorum Peer authentication was enabled via
quorum.auth.enableSasl, authorisation was performed by verifying that
the instance part in the SASL authentication ID was listed in the
zoo.cfg server list. However, this value is optional, and, if missing
(such as in 'eve@EXAMPLE.COM'), the authorisation check will be
skipped. As a result, an arbitrary endpoint could join the cluster
and begin propagating counterfeit changes to the leader, essentially
giving it complete read-write access to the data tree.

For Debian 10 buster, this problem has been fixed in version
3.4.13-2+deb10u1.

We recommend that you upgrade your zookeeper packages.

For the detailed security status of zookeeper please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/zookeeper

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