Describe CVE-2009-1381.
What is CVE-2009-1381?
The map_yp_alias function in functions/imap_general.php in SquirrelMail before 1.4.19-1 on Debian GNU/Linux, and possibly other operating systems and versions, allows remote attackers to execute arbitrary commands via shell metacharacters in a username string that is used by the ypmatch program.  NOTE: this issue exists because of an incomplete fix for CVE-2009-1579..