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Information Exposure Affecting xorg-server-lts-xenial package, versions <2:1.18.3-1ubuntu2.3~trusty2

Severity

 Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.7% (52nd percentile)

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  • Snyk IDSNYK-UBUNTU1404-XORGSERVERLTSXENIAL-273063
  • 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:14.04 xorg-server-lts-xenial to version 2:1.18.3-1ubuntu2.3~trusty2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-server-lts-xenial package and not the xorg-server-lts-xenial package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 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.