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CVE-2017-2624 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7 HIGHVector:CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624	CVE	ExploitIssue TrackingThird Party Advisory
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c	CVE	PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html	CVE	Third Party Advisory
https://security.gentoo.org/glsa/201704-03	CVE	Third Party Advisory
https://security.gentoo.org/glsa/201710-30	CVE	Third Party Advisory
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/	CVE	ExploitThird Party Advisory
http://www.securityfocus.com/bid/96480	CVE	Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037919	CVE	Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624	[email protected]	ExploitIssue TrackingThird Party Advisory
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c	[email protected]	PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html	[email protected]	Third Party Advisory
https://security.gentoo.org/glsa/201704-03	[email protected]	Third Party Advisory
https://security.gentoo.org/glsa/201710-30	[email protected]	Third Party Advisory
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/	[email protected]	ExploitThird Party Advisory
http://www.securityfocus.com/bid/96480	[email protected]	Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037919	[email protected]	Third Party AdvisoryVDB Entry

see all 16 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]
CWE-385	Covert Timing Channel	[email protected]

Affected Products

Product	Versions
x.org x server	<= 1.19.4
CPE cpe:2.3:a:x.org:x_server:::::::: Remediation No remediation found in references.
debian debian linux	7.0
CPE cpe:2.3:o:debian:debian_linux:7.0:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Aug 29, 2025	CPE Deprecation Remap	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Oct 9, 2019	CVE Modified	[email protected]
Oct 2, 2018	Initial Analysis	[email protected]
Aug 4, 2018	CVE Modified	[email protected]
Jul 29, 2018	CVE Modified	[email protected]