parse.c in sudo 1.6.9p17 through 1.6.9p19 does not properly interpret a system group (aka %group) in the sudoers file during authorization decisions for a user who belongs to that group, which allows local users to leverage an applicable sudoers file and gain root privileges via a sudo command.

References

• https://nvd.nist.gov/vuln/detail/CVE-2009-0034
• https://bugzilla.novell.com/show_bug.cgi?id=468923
• https://issues.rpath.com/browse/RPL-2954
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10856
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6462
• http://lists.vmware.com/pipermail/security-announce/2009/000060.html
• http://osvdb.org/51736
• http://secunia.com/advisories/33753
• http://secunia.com/advisories/33840
• http://secunia.com/advisories/33885
• http://secunia.com/advisories/35766
• http://wiki.rpath.com/Advisories:rPSA-2009-0021
• http://www.gratisoft.us/bugzilla/show_bug.cgi?id=327
• http://www.mandriva.com/security/advisories?name=MDVSA-2009:033
• http://www.redhat.com/support/errata/RHSA-2009-0267.html
• http://www.securityfocus.com/archive/1/500546/100/0/threaded
• http://www.securityfocus.com/archive/1/504849/100/0/threaded
• http://www.securityfocus.com/bid/33517
• http://www.securitytracker.com/id?1021688
• http://www.sudo.ws/cgi-bin/cvsweb/sudo/parse.c.diff?r1=1.160.2.21&r2=1.160.2.22&f=h
• http://www.vmware.com/security/advisories/VMSA-2009-0009.html
• http://www.vupen.com/english/advisories/2009/1865