CWE
918
Advisory Published

USN-6885-1: Apache HTTP Server vulnerabilities

First published: Mon Jul 08 2024(Updated: )

Marc Stern discovered that the Apache HTTP Server incorrectly handled serving WebSocket protocol upgrades over HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2024-36387) Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly sent certain request URLs with incorrect encodings to backends. A remote attacker could possibly use this issue to bypass authentication. (CVE-2024-38473) 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, CVE-2024-38475, CVE-2024-39573) Orange Tsai discovered that the Apache HTTP Server incorrectly handled certain response headers. A remote attacker could possibly use this issue to obtain sensitive information, execute local scripts, or perform SSRF attacks. (CVE-2024-38476) Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2024-38477) It was discovered that the Apache HTTP Server incorrectly handled certain handlers configured via AddType. A remote attacker could possibly use this issue to obtain source code. (CVE-2024-39884)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/apache2<2.4.58-1ubuntu8.2
2.4.58-1ubuntu8.2
Ubuntu=24.04
All of
ubuntu/apache2<2.4.57-2ubuntu2.5
2.4.57-2ubuntu2.5
Ubuntu=23.10
All of
ubuntu/apache2<2.4.52-1ubuntu4.10
2.4.52-1ubuntu4.10
Ubuntu=22.04
All of
ubuntu/apache2<2.4.41-4ubuntu3.19
2.4.41-4ubuntu3.19
Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6885-1?

    USN-6885-1 has been classified as a denial of service vulnerability that could allow attackers to crash the Apache HTTP Server.

  • How do I fix USN-6885-1?

    To fix USN-6885-1, update to the patched versions of the Apache2 package provided in the Ubuntu security advisory.

  • What versions of Apache are affected by USN-6885-1?

    USN-6885-1 affects multiple versions of Apache HTTP Server running on specific Ubuntu distributions prior to the patched versions.

  • Can USN-6885-1 be exploited remotely?

    Yes, a remote attacker could exploit USN-6885-1 by manipulating WebSocket protocol upgrades to cause the server to crash.

  • What software is impacted by USN-6885-1?

    USN-6885-1 impacts the Apache2 package on Ubuntu systems, specifically versions prior to the updates released in the security notice.

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