The mod_wsgi module before 3.5 for Apache, when daemon mode is enabled, does not properly handle error codes returned by setuid when run on certain Linux kernels, which allows local users to gain privileges via vectors related to the number of running processes.
http://www.securityfocus.com/bid/67532
http://www.openwall.com/lists/oss-security/2014/05/21/1
http://secunia.com/advisories/60094
http://secunia.com/advisories/59551
http://rhn.redhat.com/errata/RHSA-2014-0789.html
http://modwsgi.readthedocs.org/en/latest/release-notes/version-3.5.html
http://blog.dscpl.com.au/2014/05/security-release-for-modwsgi-version-35.html