CVE-2009-2726

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    CVE-2009-2726

    Published: 12 Aug 2009Last Modified: 10 Apr 2026

    Summary:

    Details: The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.

    References: http://labs.mudynamics.com/advisories/MU-200908-01.txt, http://secunia.com/advisories/36227, http://www.securityfocus.com/archive/1/505669/100/0/threaded, http://www.securityfocus.com/bid/36015, http://www.securitytracker.com/id?1022705, http://www.vupen.com/english/advisories/2009/2229, http://www.securityfocus.com/bid/36015, http://downloads.digium.com/pub/security/AST-2009-005.html, http://www.securityfocus.com/archive/1/505669/100/0/threaded, http://www.securityfocus.com/bid/36015, http://www.securitytracker.com/id?1022705

    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