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CVE-2017-2624

MEDIUM
Published 2018-07-27T18:00:00
Actions:

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CVSS Score

V3.0
5.9
/10
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.296
Higher than 29.6% of all CVEs

Attack Vector Metrics

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
NONE
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Xorg

xorg-x11-server

Affected Versions:

1.19.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-6pw7-qhf8-rjff

Advisory 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.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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

Advisory provided by GitHub Security Advisory Database. Published: May 13, 2022, Modified: August 29, 2025

References

https://security.gentoo.org/glsa/201704-03
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
http://www.securitytracker.com/id/1037919
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
https://security.gentoo.org/glsa/201710-30
http://www.securityfocus.com/bid/96480
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624
Published: 2018-07-27T18:00:00
Last Modified: 2024-08-05T14:02:06.893Z
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