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View Full Version : Asterisk SIP Responses Expose Valid Usernames



newsbot
06-04-2009, 04:32 PM
Asterisk PBX 1.2 through 1.6 and Trixbox PBX 2.6.1, when running with Digest authentication and authalwaysreject enabled, generates different responses depending on whether or not a SIP username is valid, which allows remote attackers to enumerate valid usernames.

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