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