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Information Exposure Affecting xorg-server package, versions <2:1.18.4-0ubuntu0.3

Severity

 Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-UBUNTU1604-XORGSERVER-327014
  • published27 Jun 2018
  • disclosed27 Jul 2018
Report a new vulnerability Found a mistake?

Introduced: 27 Jun 2018

CVE-2017-2624  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 xorg-server to version 2:1.18.4-0ubuntu0.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-server package and not the xorg-server package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 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.