- Vulnerability/
- USN-6885-4
USN-6885-4: Apache HTTP Server regression
First published: Mon Apr 07 2025(Updated: )
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)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/apache2 | <2.4.62-1ubuntu1.1 | 2.4.62-1ubuntu1.1 |
| Ubuntu | =24.10 | |
| All of | ||
| ubuntu/apache2 | <2.4.58-1ubuntu8.6 | 2.4.58-1ubuntu8.6 |
| Ubuntu | =24.04 | |
| All of | ||
| ubuntu/apache2 | <2.4.52-1ubuntu4.14 | 2.4.52-1ubuntu4.14 |
| Ubuntu | =22.04 | |
| All of | ||
| ubuntu/apache2 | <2.4.41-4ubuntu3.23 | 2.4.41-4ubuntu3.23 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/apache2 | <2.4.29-1ubuntu4.27+esm4 | 2.4.29-1ubuntu4.27+esm4 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/apache2 | <2.4.18-2ubuntu3.17+esm14 | 2.4.18-2ubuntu3.17+esm14 |
| Ubuntu | =16.04 |
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Reference Links
- https://launchpad.net/bugs/2103723
- 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
- https://ubuntu.com/security/notices/USN-6885-4 (Advisory)
Frequently Asked Questions
What is the severity of USN-6885-4?
USN-6885-4 addresses a critical vulnerability in the Apache HTTP Server mod_rewrite module that could lead to security issues.
How do I fix USN-6885-4?
To fix USN-6885-4, update your Apache package to the latest versions specified for your Ubuntu release.
What versions are affected by USN-6885-4?
USN-6885-4 affects multiple versions of Apache, specifically those in Ubuntu 16.04 to 24.10 prior to their respective patched versions.
What is the cause of the issues addressed by USN-6885-4?
The issues in USN-6885-4 were caused by an incomplete patch for CVE-2024-38474 that led to regressions in the Apache HTTP Server.
Who discovered the vulnerability related to USN-6885-4?
The vulnerability related to USN-6885-4 was discovered by security researcher Orange Tsai.
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