UBUNTU-CVE-2016-1908

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    UBUNTU-CVE-2016-1908

    Published: 15 Jan 2016Last Modified: 1 Jun 2026
    Upstream:
    CVE-2016-1908
    Aliases:
    USN-2966-1

    Summary:

    Details: The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

    References: https://ubuntu.com/security/CVE-2016-1908, https://lists.mindrot.org/pipermail/openssh-unix-dev/2016-January/034684.html, https://thejh.net/written-stuff/openssh-6.8-xsecurity, http://seclists.org/oss-sec/2016/q1/115, https://ubuntu.com/security/notices/USN-2966-1, https://www.cve.org/CVERecord?id=CVE-2016-1908

    Affected packages

    Package

    Name: openssh

    Purl: pkg:deb/ubuntu/openssh?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:6.6p1-2ubuntu2.7

    Affected versions

    1:6.2p2-6

    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
    UBUNTU-CVE-2016-1908 | CVE-DB