CVE-2024-38475

EUVD-2024-37356

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 are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. 

Substitutions in server 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	Primary	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
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

Base Score

CVSS 3.x

EPSS Score

Percentile: 99%

Affected Products (NVD)

Vendor	Product	Version
apache	http_server	2.4.0 ≤ 𝑥 < 2.4.60
netapp	ontap_9	-
sonicwall	sma_200_firmware	𝑥 < 10.2.1.14-75sv
sonicwall	sma_210_firmware	𝑥 < 10.2.1.14-75sv
sonicwall	sma_400_firmware	𝑥 < 10.2.1.14-75sv
sonicwall	sma_410_firmware	𝑥 < 10.2.1.14-75sv
sonicwall	sma_500v_firmware	𝑥 < 10.2.1.14-75sv

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

apache2

bookworm	2.4.65-1~deb12u1 fixed
bookworm (security)	2.4.62-1~deb12u2 fixed
bullseye	2.4.62-1~deb11u1 fixed
bullseye (security)	2.4.65-1~deb11u1 fixed
forky	2.4.65-3 fixed
sid	2.4.66-2 fixed
trixie	2.4.65-2 fixed

Ubuntu Releases

Ubuntu Product

Codename

apache2

bionic	Fixed 2.4.29-1ubuntu4.27+esm3 released
focal	Fixed 2.4.41-4ubuntu3.19 released
jammy	Fixed 2.4.52-1ubuntu4.10 released
mantic	Fixed 2.4.57-2ubuntu2.5 released
noble	Fixed 2.4.58-1ubuntu8.2 released
oracular	Fixed 2.4.62-1ubuntu1 released
plucky	Fixed 2.4.62-1ubuntu1 released
trusty	Fixed 2.4.7-1ubuntu4.22+esm10 released
xenial	Fixed 2.4.18-2ubuntu3.17+esm13 released

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://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018

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

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475