CVE-2017-2624

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.

• CWE-385
• CWE-200

• http://www.securityfocus.com/bid/96480Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1037919Third Party Advisory, VDB Entry
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624Exploit, Issue Tracking, Third Party Advisory
• https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627cPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlThird Party Advisory
• https://security.gentoo.org/glsa/201704-03Third Party Advisory
• https://security.gentoo.org/glsa/201710-30Third Party Advisory
• https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/Exploit, Third Party Advisory
• http://www.securityfocus.com/bid/96480Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1037919Third Party Advisory, VDB Entry
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624Exploit, Issue Tracking, Third Party Advisory
• https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627cPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlThird Party Advisory
• https://security.gentoo.org/glsa/201704-03Third Party Advisory
• https://security.gentoo.org/glsa/201710-30Third Party Advisory
• https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/Exploit, Third Party Advisory

Published

Jul 27, 2018

Last Modified

Jun 17, 2026

Status

Modified

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