Information Exposure Affecting xorg-server-hwe-16.04 package, versions <2:1.18.4-1ubuntu6.1~16.04.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-XORGSERVERHWE1604-278443
- published27 Jun 2018
- disclosed27 Jul 2018
Introduced: 27 Jun 2018
CVE-2017-2624 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 xorg-server-hwe-16.04 to version 2:1.18.4-1ubuntu6.1~16.04.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xorg-server-hwe-16.04 package and not the xorg-server-hwe-16.04 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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-2624
- https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
- https://security-tracker.debian.org/tracker/CVE-2017-2624
- https://security.gentoo.org/glsa/201704-03
- https://security.gentoo.org/glsa/201710-30
- https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624
- http://www.securityfocus.com/bid/96480
- http://www.securitytracker.com/id/1037919