USN-6885-2: Apache HTTP Server regression

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)