CVE-2016-0739

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    CVE-2016-0739

    Published: 13 Apr 2016Last Modified: 8 Jul 2026

    Summary:

    Details: libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

    References: http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html, http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html, http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html, https://puppet.com/security/cve/CVE-2016-0739, http://rhn.redhat.com/errata/RHSA-2016-0566.html, http://www.debian.org/security/2016/dsa-3488, http://www.ubuntu.com/usn/USN-2912-1, https://security.gentoo.org/glsa/201606-12, https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/, https://www.libssh.org/security/advisories/CVE-2016-0739.txt

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    libssh-0.7.2
    libssh-0.7.1
    libssh-0.7.0

    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