CVE-2013-4434

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    CVE-2013-4434

    Published: 25 Oct 2013Last Modified: 16 Apr 2026

    Summary:

    Details: Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.

    References: http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html, http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html, http://secunia.com/advisories/55173, http://www.openwall.com/lists/oss-security/2013/10/16/11, http://www.securityfocus.com/bid/62993, https://matt.ucc.asn.au/dropbear/CHANGES, https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a, https://support.citrix.com/article/CTX216642, http://www.openwall.com/lists/oss-security/2013/10/16/11, https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a

    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
    CVE-2013-4434 | CVE-DB