CVE-2009-3727

    Dashboard / Vulnerabilities / CVE-2009-3727

    CVE-2009-3727

    Published: 10 Nov 2009Last Modified: 10 Apr 2026

    Summary:

    Details: Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.3, 1.6.0.x before 1.6.0.17, and 1.6.1.x before 1.6.1.9; Business Edition A.x.x, B.x.x before B.2.5.12, C.2.x.x before C.2.4.5, and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames via multiple crafted REGISTER messages with inconsistent usernames in the URI in the To header and the Digest in the Authorization header.

    References: http://downloads.asterisk.org/pub/security/AST-2009-008.html, http://secunia.com/advisories/37265, http://secunia.com/advisories/37479, http://secunia.com/advisories/37677, http://www.debian.org/security/2009/dsa-1952, http://www.securityfocus.com/bid/36924, https://bugzilla.redhat.com/show_bug.cgi?id=523277, https://bugzilla.redhat.com/show_bug.cgi?id=533137, http://osvdb.org/59697, http://www.securitytracker.com/id?1023133, https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html, https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html

    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