CVE-2017-2624 — Covert Timing Channel in X Server

CWE-385 — Covert Timing ChannelCWE-200 — Sensitive Information Exposure9 documents8 sources
Severity
7.0HIGHNVD
CNA5.9
EPSS
0.0%
top 85.83%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
X.org Xorg-serverX.org X ServerXorg Xorg-x11-server+1 more
Timeline
PublishedJul 27
Latest updateMay 13

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.

CVSS vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9

Affected Packages3 packages

▶Debianx.org/xorg-server< 2:1.19.2-1+3
▶CVEListV5xorg/xorg-x11-server1.19.0
▶NVDx.org/x_server1.19.4

Also affects: Debian Linux 7.0

Patches

Patch: gitlab.freedesktop.org ↗Patch: gitlab.freedesktop.org ↗

🔴Vulnerability Details

3
GHSA
GHSA-6pw7-qhf8-rjff: It was found that xorg-x11-server before 1↗2022-05-13
▶
CVEList
CVE-2017-2624: It was found that xorg-x11-server before 1↗2018-07-27
▶
OSV
CVE-2017-2624: It was found that xorg-x11-server before 1↗2018-07-27
▶

📋Vendor Advisories

3
Ubuntu
X.Org X server vulnerabilities↗2017-07-24
▶
Red Hat
xorg-x11-server: timing attack against MIT Cookie↗2017-02-28
▶
Debian
CVE-2017-2624: xorg-server - It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check...↗2017
▶

💬Community

2
Bugzilla
CVE-2017-2624 xorg-x11-server: timing attack against MIT Cookie [fedora-all]↗2017-02-28
▶
Bugzilla
CVE-2017-2624 xorg-x11-server: timing attack against MIT Cookie↗2017-02-20
▶
CVE-2017-2624 — Covert Timing Channel in X.org X Server | cvebase