CVE-2023-25690

Published Mar 7, 2023

Last updated 4 months ago

Apache HTTP Server

Overview

AI description

Automated description summarized from trusted sources.

CVE-2023-25690 is a vulnerability in Apache HTTP Server versions 2.4.0 through 2.4.55. It involves a HTTP Request Smuggling attack that can occur in certain `mod_proxy` configurations. These configurations are affected when `mod_proxy` is enabled alongside some form of `RewriteRule` or `ProxyPassMatch` where a non-specific pattern matches a portion of the user-supplied request-target (URL) data, which is then re-inserted into the proxied request-target using variable substitution. This vulnerability can lead to request splitting or smuggling, potentially allowing attackers to bypass access controls on the proxy server. It can also result in unintended proxying of URLs to existing origin servers and cache poisoning. To mitigate this vulnerability, it is recommended to update to Apache version 2.4.56 or later.

Description: 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.
Source: security@apache.org
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

security@apache.org: CWE-444

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "3C9A570C-537D-4D4C-AF79-28DFB302B221",
            "versionEndIncluding": "2.4.55",
            "versionStartIncluding": "2.4.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.