Test ID:	1.3.6.1.4.1.25623.1.1.1.2.2023.3624
Category:	Debian Local Security Checks
Title:	Debian: Security Advisory (DLA-3624-1)
Summary:	The remote host is missing an update for the Debian 'zookeeper' package(s) announced via the DLA-3624-1 advisory.
Description:	Summary: The remote host is missing an update for the Debian 'zookeeper' package(s) announced via the DLA-3624-1 advisory. Vulnerability Insight: A potential authorisation bypass vulnerability was discovered 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. CVE-2023-44981 Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper. If SASL Quorum Peer authentication is enabled in ZooKeeper (quorum.auth.enableSasl=true), the authorization is done by verifying that the instance part in SASL authentication ID is listed in zoo.cfg server list. The instance part in SASL auth ID is optional and if it's missing, like 'eve@EXAMPLE.COM', the authorization 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. Quorum Peer authentication is not enabled by default. Users are recommended to upgrade to version 3.9.1, 3.8.3, 3.7.2, which fixes the issue. Alternately ensure the ensemble election/quorum communication is protected by a firewall as this will mitigate the issue. See the documentation for more details on correct cluster administration. For Debian 10 Buster, this problem has been fixed in version 3.4.13-2+deb10u1. We recommend that you upgrade your zookeeper packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references] Affected Software/OS: 'zookeeper' package(s) on Debian 10. Solution: Please install the updated package(s). CVSS Score: 9.4 CVSS Vector: AV:N/AC:L/Au:N/C:C/I:C/A:N
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2023-44981 Debian Security Information: DSA-5544 (Google Search) https://www.debian.org/security/2023/dsa-5544 https://lists.apache.org/thread/wf0yrk84dg1942z1o74kd8nycg6pgm5b https://lists.debian.org/debian-lts-announce/2023/10/msg00029.html http://www.openwall.com/lists/oss-security/2023/10/11/4
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