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Ubuntu Security Notice USN-6885-1
July 08, 2024

apache2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Apache HTTP Server.

Software Description:
- apache2: Apache HTTP server

Details:

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
   apache2                         2.4.58-1ubuntu8.2

Ubuntu 23.10
   apache2                         2.4.57-2ubuntu2.5

Ubuntu 22.04 LTS
   apache2                         2.4.52-1ubuntu4.10

Ubuntu 20.04 LTS
   apache2                         2.4.41-4ubuntu3.19

In general, a standard system update will make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6885-1
   CVE-2024-36387, CVE-2024-38473, CVE-2024-38474, CVE-2024-38475,
   CVE-2024-38476, CVE-2024-38477, CVE-2024-39573, CVE-2024-39884

Package Information:
   https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.2
   https://launchpad.net/ubuntu/+source/apache2/2.4.57-2ubuntu2.5
   https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.10
   https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.19