CVE-2011-2536

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    CVE-2011-2536

    Published: 6 Jul 2011Last Modified: 10 Apr 2026

    Summary:

    Details: chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, 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.

    References: http://downloads.asterisk.org/pub/security/AST-2011-011.html, http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diff, http://www.securitytracker.com/id?1025734

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High