CVE-2010-0685 Information

Description

The design of the dialplan functionality in Asterisk Open Source 1.2.x 1.4.x and 1.6.x; and Asterisk Business Edition B.x.x and C.x.x when using the $EXTEN channel variable and wildcard pattern matches allows context-dependent attackers to inject strings into the dialplan using metacharacters that are injected when the variable is expanded as demonstrated using the Dial application to process a crafted SIP INVITE message that adds an unintended outgoing channel leg. NOTE: it could be argued that this is not a vulnerability in Asterisk but a class of vulnerabilities that can occur in any program that uses this feature without the associated filtering functionality that is already available.

Reference

http://downloads.digium.com/pub/security/AST-2010-002.html http://lists.fedoraproject.org/pipermail/package-announce/2010-March/037679.html http://secunia.com/advisories/38641 http://secunia.com/advisories/39096 http://svn.asterisk.org/svn/asterisk/branches/1.2/README-SERIOUSLY.bestpractices.txt http://www.securityfocus.com/archive/1/509608/100/0/threaded http://www.securitytracker.com/id?1023637 http://www.vupen.com/english/advisories/2010/0439 https://exchange.xforce.ibmcloud.com/vulnerabilities/56397