Research > Zero-Day Tracker > 20111102
Apache HTTP Server ap_pregsub() buffer overflow
Apache Software Foundation
Apache HTTP Server 2.2.21 and earlier
There is an integer overflow vulnerability in the ap_pregsub function of the Apache Web server. This integer overflow can lead to a buffer overflow and allow an attacker to execute arbitrary code. The Apache Web server runs with elevated privileges, an attacker would need to exploit this locally but would gain elevated privileges on the machine.
Local Elevation of Privilege to root privileges
This local vulnerability allows an attacker with file write privileges to run arbitrary code under the context of the Apache Server.
Disable the use of ".htaccess" on all locations that are writable by normal users.
15584 - Apache Mod_SetEnvIf .htaccess Privilege Escalation
11.02.2011 - Public Information Released
1.31.2012 - Apache releases HTTP Server 2.2.22, which contains a fix for CVE-2011-3607
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