The configuration merger in itk.c in the Steinar H. Gunderson mpm-itk Multi-Processing Module 2.2.11-01 and 2.2.11-02 for the Apache HTTP Server does not properly handle certain configuration sections that specify NiceValue but not AssignUserID, which might allow remote attackers to gain privileges by leveraging the root uid and root gid of an mpm-itk process.
https://exchange.xforce.ibmcloud.com/vulnerabilities/66248
http://www.vupen.com/english/advisories/2011/0824
http://www.vupen.com/english/advisories/2011/0749
http://www.vupen.com/english/advisories/2011/0748
http://www.securityfocus.com/bid/46953
http://www.mandriva.com/security/advisories?name=MDVSA-2011:057
http://www.debian.org/security/2011/dsa-2202
http://openwall.com/lists/oss-security/2011/03/21/13
http://openwall.com/lists/oss-security/2011/03/20/1
http://lists.err.no/pipermail/mpm-itk/2011-March/000394.html
http://lists.err.no/pipermail/mpm-itk/2011-March/000393.html