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VID 210238
Severity 40
Port 80, ...
Protocol TCP
Class WWW
Detailed Description The version of Apache httpd installed on the remote host is prior to 2.4.56. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.56 advisory.

- HTTP request splitting with mod_rewrite and mod_proxy: 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 http://example.com:8080/elsewhere ; [P] ProxyPassReverse /here/ http://example.com:8080/ 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. Acknowledgements (CVE-2023-25690)

- Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting: HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55.
Special characters in the origin response header can truncate/split the response forwarded to the client. (CVE-2023-27522)

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

* Platforms Affected:
Apache HTTP versions 2.4.x prior to 2.4.56
Any operating system Any version
Recommendation Upgrade to the latest version of Apache HTTP Server (2.4.56 or later), available from the Apache Software Foundation download site, http://httpd.apache.org/download.cgi
Related URL CVE-2023-25690,CVE-2023-27522 (CVE)
Related URL (SecurityFocus)
Related URL (ISS)