CVE-2009-1579
The map_yp_alias function in functions/imap_general.php in SquirrelMail before 1.4.18 and NaSMail before 1.7 allows remote attackers to execute arbitrary commands via shell metacharacters in a username string that is used by the ypmatch program.
Date published : 2009-05-14
http://lists.apple.com/archives/security-announce/2010//Jun/msg00001.html