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CVE-2011-4317

UnknownEPSS 60.78%

Last modified

CVE-2011-4317 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 60.78% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
60.78%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
ApacheHttp Server1.3—
ApacheHttp Server1.3.0—
ApacheHttp Server1.3.1—
ApacheHttp Server1.3.1.1—
ApacheHttp Server1.3.2—
ApacheHttp Server1.3.3—
ApacheHttp Server1.3.4—
ApacheHttp Server1.3.5—
ApacheHttp Server1.3.6—
ApacheHttp Server1.3.7—
ApacheHttp Server1.3.8—
ApacheHttp Server1.3.9—
ApacheHttp Server1.3.10—
ApacheHttp Server1.3.11—
ApacheHttp Server1.3.12—
ApacheHttp Server1.3.13—
ApacheHttp Server1.3.14—
ApacheHttp Server1.3.15—
ApacheHttp Server1.3.16—
ApacheHttp Server1.3.17—
ApacheHttp Server1.3.18—
ApacheHttp Server1.3.19—
ApacheHttp Server1.3.20—
ApacheHttp Server1.3.22—
ApacheHttp Server1.3.23—
ApacheHttp Server1.3.24—
ApacheHttp Server1.3.25—
ApacheHttp Server1.3.26—
ApacheHttp Server1.3.27—
ApacheHttp Server1.3.28—
ApacheHttp Server1.3.29—
ApacheHttp Server1.3.30—
ApacheHttp Server1.3.31—
ApacheHttp Server1.3.32—
ApacheHttp Server1.3.33—
ApacheHttp Server1.3.34—
ApacheHttp Server1.3.35—
ApacheHttp Server1.3.36—
ApacheHttp Server1.3.37—
ApacheHttp Server1.3.38—
ApacheHttp Server1.3.39—
ApacheHttp Server1.3.41—
ApacheHttp Server1.3.42—
ApacheHttp Server1.3.65—
ApacheHttp Server1.3.68—
ApacheHttp Server2.0—
ApacheHttp Server2.0.9—
ApacheHttp Server2.0.28—
ApacheHttp Server2.0.32—
ApacheHttp Server2.0.34Beta

Showing 50 of 98 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2011-4317?
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 severe is CVE-2011-4317?
Severity scoring for CVE-2011-4317 is pending analysis. The EPSS model estimates a 60.78% probability of exploitation in the next 30 days.
How do I fix CVE-2011-4317?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST