CVE-2011-4317 Server-side request forgery in n/a

What is CVE-2011-4317?

CVE-2011-4317 is a medium-severity server-side request forgery vulnerability in Apache Http Server, published on 30 Nov 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Weakness: CWE-20

Which versions are affected by CVE-2011-4317?

It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2011-4317?

Apply the vendor's patch.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2011-4317 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-4317 exists.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2011-4317, GHSA-2m6p-rg3r-28gh.