CVE-2011-4415

Public Exploit

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.

Category

1.2
CVSS
Severity: Low
CVSS 2.0 •
EPSS 0.68% Top 30%
Vendor Advisory hp.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041 vendor advisory
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html exploit
http://www.gossamer-threads.com/lists/apache/dev/403775
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/ patch exploit

Frequently Asked Questions

What is the severity of CVE-2011-4415?
CVE-2011-4415 has been scored as a low severity vulnerability.
How to fix CVE-2011-4415?
To fix CVE-2011-4415, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-4415 being actively exploited in the wild?
It is possible that CVE-2011-4415 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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