CVE-2023-25690 Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

2023-03-0715:09:03

CWE-444

apache

www.cve.org

cve-2023-25690

http request smuggling

mod_rewrite

mod_proxy

apache http server

proxypassmatch

rewriterule

access controls

cache poisoning

9.8 High

AI Score

Confidence

High

0.007 Low

EPSS

Percentile

81.0%

JSON

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.

CNA Affected

[
  {
    "defaultStatus": "unknown",
    "product": "Apache HTTP Server",
    "vendor": "Apache Software Foundation",
    "versions": [
      {
        "lessThanOrEqual": "2.4.55",
        "status": "affected",
        "version": "2.4.0",
        "versionType": "semver"
      }
    ]
  }
]