Computer Security
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Asterisk user account enumeration
SecurityVulns ID:11757
Threat Level:
Description:Different replies on mismatched usernames and passwords.
Affected:DIGIUM : Asterisk 1.4
 ASTERISK : Asterisk 1.6
 ASTERISK : Asterisk 1.8
CVE:CVE-2011-2536 (chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before, 1.6.2.x before, and 1.8.x before, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.)
Original documentdocumentASTERISK, AST-2011-011: Possible enumeration of SIP users due to differing authentication responses (04.07.2011)

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