CVE-2024-38475

01.07.2024, 19:15

Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that arepermitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. 

Substitutions inserver context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	9.1 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
apache	CNA	---				---
CISA-ADP	ADP	9.1 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 99%

Vendor	Product	Version
apache	http_server	2.4.0 ≤ 𝑥 < 2.4.60
netapp	ontap_9	-

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

apache2

bullseye	2.4.62-1~deb11u1 fixed
bullseye (security)	2.4.62-1~deb11u2 fixed
bookworm	2.4.62-1~deb12u2 fixed
bookworm (security)	2.4.62-1~deb12u2 fixed
sid	2.4.63-1 fixed
trixie	2.4.63-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

apache2

plucky	Fixed 2.4.62-1ubuntu1 released
oracular	Fixed 2.4.62-1ubuntu1 released
noble	Fixed 2.4.58-1ubuntu8.2 released
mantic	Fixed 2.4.57-2ubuntu2.5 released
jammy	Fixed 2.4.52-1ubuntu4.10 released
focal	Fixed 2.4.41-4ubuntu3.19 released
bionic	Fixed 2.4.29-1ubuntu4.27+esm3 released
xenial	Fixed 2.4.18-2ubuntu3.17+esm13 released
trusty	needs-triage

Common Weakness Enumeration

CWE-116 - Improper Encoding or Escaping of Output
The software prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References

https://httpd.apache.org/security/vulnerabilities_24.html

https://security.netapp.com/advisory/ntap-20240712-0001/

http://www.openwall.com/lists/oss-security/2024/07/01/8

https://github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf

https://httpd.apache.org/security/vulnerabilities_24.html

https://security.netapp.com/advisory/ntap-20240712-0001/

https://www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227