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CVE-2011-4415

1.2 · LOW

The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of en…

Published Nov 8, 2011apacheCWE-20EPSS 3.02%

Overview

CVE-2011-4415 is a low-severity vulnerability affecting apache http_server. It was published on November 8, 2011 and has a CVSS 2.0 base score of 1.2 (LOW).

This vulnerability has a CVSS 2.0 base score of 1.2, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.

Remediation

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refh20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041Refwww.gossamer-threads.com/lists/apache/dev/403775Refwww.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/Refwww.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.htmlRefh20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041Refwww.gossamer-threads.com/lists/apache/dev/403775Refwww.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/Refwww.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html

How CyberStrike helps

Frequently asked questions

What is CVE-2011-4415?

CVE-2011-4415 is a low-severity vulnerability affecting apache http_server. It was published on November 8, 2011 and has a CVSS 2.0 base score of 1.2 (LOW).

How severe is CVE-2011-4415?

This vulnerability has a CVSS 2.0 base score of 1.2, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-4415?

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-4415?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-4415 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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