========================================================================== Ubuntu Security Notice USN-6885-4 April 07, 2025
apache2 regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
USN-6885-1 introduced a regression in Apache HTTP Server.
Software Description:
- apache2: Apache HTTP server
Details:
USN-6885-1 fixed a vulnerability in Apache. The patch
for CVE-2024-38474 was incomplete and caused regressions.
This update provides the fix for that issue.
Original advisory details:
Orange Tsai discovered that the Apache HTTP Server mod_rewrite module
incorrectly handled certain substitutions. A remote attacker could
possibly use this issue to execute scripts in directories not directly
reachable by any URL, or cause a denial of service. Some environments
may require using the new UnsafeAllow3F flag to handle unsafe
substitutions. (CVE-2024-38474)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 24.10
apache2 2.4.62-1ubuntu1.1
Ubuntu 24.04 LTS
apache2 2.4.58-1ubuntu8.6
Ubuntu 22.04 LTS
apache2 2.4.52-1ubuntu4.14
Ubuntu 20.04 LTS
apache2 2.4.41-4ubuntu3.23
Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm4
Available with Ubuntu Pro
Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm14
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6885-4
https://ubuntu.com/security/notices/USN-6885-3
https://ubuntu.com/security/notices/USN-6885-2
https://ubuntu.com/security/notices/USN-6885-1
https://launchpad.net/bugs/2103723
Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.62-1ubuntu1.1
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.6
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.14
https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.23
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