CVE-2023-41081 — Apache Tomcat Connectors: Unexpected use of first declared worker in mod_jk for unmapped request

Affected: Apache Software Foundation Apache Tomcat Connectors, apache tomcat_connectors

Important: Authentication Bypass CVE-2023-41081

The mod_jk component of Apache Tomcat Connectors in some circumstances, such as when a configuration included "JkOptions +ForwardDirectories" but the configuration did not provide explicit mounts for all possible proxied requests, mod_jk would use an implicit mapping and map the request to the first defined worker. Such an implicit mapping could result in the unintended exposure of the status worker and/or bypass security constraints configured in httpd. As of JK 1.2.49, the implicit mapping functionality has been removed and all mappings must now be via explicit configuration. Only mod_jk is affected by this issue. The ISAPI redirector is not affected.

This issue affects Apache Tomcat Connectors (mod_jk only): from 1.2.0 through 1.2.48.

Users are recommended to upgrade to version 1.2.49, which fixes the issue.

History 2023-09-13 Original advisory

2023-09-28 Updated summary

USN-6826-1 — libapache-mod-jk vulnerability

Affected: Ubuntu:Pro:16.04:LTS: libapache-mod-jk, Ubuntu:Pro:18.04:LTS: libapache-mod-jk, Ubuntu:20.04:LTS: libapache-mod-jk, Ubuntu:22.04:LTS: libapache-mod-jk

Karl von Randow discovered that mod_jk was vulnerable to an authentication bypass. If the configuration did not provide explicit mounts for all possible proxied requests, an attacker could possibly use this vulnerability to bypass security constraints configured in httpd.

Most recent entries from all

CVE-2023-41081 — Apache Tomcat Connectors: Unexpected use of first declared worker in mod_jk for unmapped request

USN-6826-1 — libapache-mod-jk vulnerability