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Covert Timing Channel Affecting xorg-x11-server-common package, versions *

Severity

 Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.12% (47th percentile)

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  • Snyk IDSNYK-RHEL7-XORGX11SERVERCOMMON-1368848
  • published26 Jul 2021
  • disclosed28 Feb 2017
Report a new vulnerability Found a mistake?

Introduced: 28 Feb 2017

CVE-2017-2624  (opens in a new tab)
CWE-385  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 xorg-x11-server-common.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-x11-server-common package and not the xorg-x11-server-common package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.