UBUNTU-CVE-2015-6563

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    UBUNTU-CVE-2015-6563

    Published: 24 Aug 2015Last Modified: 29 May 2026
    Upstream:
    CVE-2015-6563
    Aliases:
    USN-2710-1

    Summary:

    Details: The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

    References: https://ubuntu.com/security/CVE-2015-6563, https://anongit.mindrot.org/openssh.git/commit/?id=d4697fe9a28dab7255c60433e4dd23cf7fce8a8b, http://www.openwall.com/lists/oss-security/2015/08/11/9, https://github.com/openssh/openssh-portable/commit/d4697fe9a28dab7255c60433e4dd23cf7fce8a8b, http://www.openwall.com/lists/oss-security/2015/08/22/1, http://www.openssh.com/txt/release-7.0, http://seclists.org/fulldisclosure/2015/Aug/54, https://ubuntu.com/security/notices/USN-2710-1, https://www.cve.org/CVERecord?id=CVE-2015-6563

    Affected packages

    Package

    Name: openssh

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

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

    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