UBUNTU-CVE-2017-2624

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    UBUNTU-CVE-2017-2624

    Published: 1 Mar 2017Last Modified: 22 Apr 2026
    Upstream:
    CVE-2017-2624
    Aliases:
    USN-3362-1

    Summary:

    Details: It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.

    References: https://ubuntu.com/security/CVE-2017-2624, https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/, http://openwall.com/lists/oss-security/2017/03/01/1, https://ubuntu.com/security/notices/USN-3362-1, https://www.cve.org/CVERecord?id=CVE-2017-2624

    Affected packages

    Package

    Name: xorg-server

    Purl: pkg:deb/ubuntu/xorg-server@2:1.15.1-0ubuntu2.9?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:1.15.1-0ubuntu2.9

    Affected versions

    2:1.14.3-3ubuntu2
    2:1.14.3-3ubuntu3
    2:1.14.3-3ubuntu4
    2:1.14.3-5ubuntu1
    2:1.14.4-1ubuntu1
    2:1.14.4-1ubuntu2
    2:1.14.4.901-0ubuntu2
    2:1.14.5-1ubuntu2
    2:1.14.5-1ubuntu4

    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-2017-2624 | CVE-DB