CVE-2023-25690

Summary

Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.

Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like:

RewriteEngine on RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P] ProxyPassReverse /here/ http://example.com:8080/

Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server.

Affected Software

Weaknesses

• CWE-444: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

ADP Enrichment

CVE Program Container

Additional References

• https://httpd.apache.org/security/vulnerabilities_24.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00028.html
• https://security.gentoo.org/glsa/202309-01
• http://packetstormsecurity.com/files/176334/Apache-2.4.55-mod_proxy-HTTP-Request-Smuggling.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: total

References

• https://httpd.apache.org/security/vulnerabilities_24.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00028.html
• https://security.gentoo.org/glsa/202309-01
• http://packetstormsecurity.com/files/176334/Apache-2.4.55-mod_proxy-HTTP-Request-Smuggling.html

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