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Ubuntu Security Notice USN-6885-2
July 11, 2024
apache2 regression
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
USN-6885-1 introduced a regression in Apache HTTP Server.
Software Description:
- apache2: Apache HTTP server
Details:
USN-6885-1 fixed vulnerabilities in Apache HTTP Server. One of the security
fixes introduced a regression when proxying requests to a HTTP/2 server.
This update fixes the problem.
We apologize for the inconvenience.
Original advisory 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                         2.4.58-1ubuntu8.3
Ubuntu 22.04 LTS
   apache2                         2.4.52-1ubuntu4.11
Ubuntu 20.04 LTS
   apache2                         2.4.41-4ubuntu3.20
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6885-2
   https://ubuntu.com/security/notices/USN-6885-1
   https://launchpad.net/bugs/2072648
Package Information:
   https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.3
   https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.11
   https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.20