CVE-2017-2624

Name: CVE-2017-2624
Creator: NVD / NIST
Published: 2018-07-27T18:29:00.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.68%

Last modified Jun 17, 2026

CVE-2017-2624 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

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

EPSS Probability

0.68%

47.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
X.Org	X Server	<= 1.19.4
Debian	Debian Linux	7.0

References

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

Timeline

Published: Jul 27, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-2624?

How severe is CVE-2017-2624?

Severity scoring for CVE-2017-2624 is pending analysis. The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2017-2624?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-2624?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST