CVE-2023-25690
Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy
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.
How to fix CVE-2023-25690
To remediate CVE-2023-25690, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.56-r0 or later
- —upgrade to 2.4.56 or later
- —upgrade to 2.4.56-1~deb11u1 or later
- —upgrade to 2.4.38-3+deb10u10 or later
Is CVE-2023-25690 being exploited?
Likely — EPSS is 83.8%, placing CVE-2023-25690 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 2.4.56-r0
- >= 2.4.0, < 2.4.56
- from 0, < 2.4.56-1~deb11u1
- from 0, < 2.4.38-3+deb10u10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |