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.
Apache Software Foundation
Apache HTTP Server 2.2.21 and earlier
Elevation of Privilege
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.
BeyondTrust Prevention and Detection:
- 15584 - Apache Mod_SetEnvIf .htaccess Privilege Escalation
Disable the use of ".htaccess" on all locations that are writable by normal users.