CVE-2011-4415

EPSS 3.1%

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.

Affected products

n/a · n/a

public PoCs found — 1

exploitdbwww.exploit-db.com/exploits/41769unverified

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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/http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html