CVE-2017-2624

Public Exploit

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.

Categories

5.9
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.04%
Vendor Advisory gentoo.org Vendor Advisory gentoo.org
Affected: Xorg xorg-x11-server
Published at:
Updated at:

References

Link Tags
https://security.gentoo.org/glsa/201704-03 third party advisory vendor advisory
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c third party advisory patch
http://www.securitytracker.com/id/1037919 vdb entry third party advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html third party advisory mailing list
https://security.gentoo.org/glsa/201710-30 third party advisory vendor advisory
http://www.securityfocus.com/bid/96480 vdb entry third party advisory
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/ third party advisory exploit
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624 issue tracking exploit third party advisory

Frequently Asked Questions

What is the severity of CVE-2017-2624?
CVE-2017-2624 has been scored as a medium severity vulnerability.
How to fix CVE-2017-2624?
To fix CVE-2017-2624, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-2624 being actively exploited in the wild?
It is possible that CVE-2017-2624 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-2624?
CVE-2017-2624 affects Xorg xorg-x11-server.
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