CVE-2013-4548

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    CVE-2013-4548

    Published: 8 Nov 2013Last Modified: 10 Apr 2026

    Summary:

    Details: The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

    References: http://www.openssh.com/txt/gcmrekey.adv, http://www.ubuntu.com/usn/USN-2014-1, http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html, http://marc.info/?l=bugtraq&m=141576985122836&w=2, http://openwall.com/lists/oss-security/2013/11/08/3

    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