CVE-2013-2264 Information

Description

The SIP channel driver in Asterisk Open Source 1.8.x before 1.8.20.2 10.x before 10.12.2 and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; Asterisk Business Edition (BE) C.3.x before C.3.8.1; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones exhibits different behavior for invalid INVITE SUBSCRIBE and REGISTER transactions depending on whether the user account exists which allows remote attackers to enumerate account names by (1) reading HTTP status codes (2) reading additional text in a 403 (aka Forbidden) response or (3) observing whether certain retransmissions occur.

Reference

http://downloads.asterisk.org/pub/security/AST-2013-003.html https://issues.asterisk.org/jira/browse/ASTERISK-21013