CVE-2017-2624

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    CVE-2017-2624

    Published: 27 Jul 2018Last Modified: 7 Aug 2026

    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: http://www.securityfocus.com/bid/96480, http://www.securitytracker.com/id/1037919, https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html, https://security.gentoo.org/glsa/201704-03, https://security.gentoo.org/glsa/201710-30, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624, https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c, https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    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
    CVE-2017-2624 | CVE-DB