Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | 2.0 |
Related Weaknesses (CWE)
References
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
- http://www.gossamer-threads.com/lists/apache/dev/403775
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/ExploitPatch
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploiExploit
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
- http://www.gossamer-threads.com/lists/apache/dev/403775
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/ExploitPatch
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploiExploit
FAQ
What is CVE-2011-4415?
CVE-2011-4415 is a vulnerability with a CVSS score of 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 envir...
How severe is CVE-2011-4415?
CVE-2011-4415 has been rated LOW with a CVSS base score of 1.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2011-4415?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.