Sudo 1.7.0 through 1.7.4p3, when a Runas group is configured, does not properly handle use of the -u option in conjunction with the -g option, which allows local users to gain privileges via a command line containing a "-u root" sequence.
https://bugzilla.redhat.com/show_bug.cgi?id=628628
http://www.vupen.com/english/advisories/2011/0025
http://www.vupen.com/english/advisories/2010/2358
http://www.vupen.com/english/advisories/2010/2320
http://www.vupen.com/english/advisories/2010/2318
http://www.vupen.com/english/advisories/2010/2312
http://www.vmware.com/security/advisories/VMSA-2011-0001.html
http://www.ubuntu.com/usn/USN-983-1
http://www.sudo.ws/sudo/alerts/runas_group.html
http://www.securitytracker.com/id?1024392
http://www.securityfocus.com/bid/43019
http://www.securityfocus.com/archive/1/515545/100/0/threaded
http://www.securityfocus.com/archive/1/514489/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2010-0675.html
http://www.mandriva.com/security/advisories?name=MDVSA-2010:175
http://wiki.rpath.com/Advisories:rPSA-2010-0075
http://security.gentoo.org/glsa/glsa-201009-03.xml
http://secunia.com/advisories/42787
http://secunia.com/advisories/41316
http://secunia.com/advisories/40508
http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-September/047516.html