CVE-2011-4317
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.
How to fix CVE-2011-4317
To remediate CVE-2011-4317, upgrade the affected package to a fixed version below.
- —upgrade to 2.2.21-3 or later
Is CVE-2011-4317 being exploited?
Likely — EPSS is 78.0%, placing CVE-2011-4317 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (1)
- from 0, < 2.2.21-3