Information Exposure Affecting xorg-server package, versions <2:1.19.2-1
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Test your applications- Snyk ID SNYK-DEBIAN9-XORGSERVER-327011
- published 27 Jun 2018
- disclosed 27 Jul 2018
Introduced: 27 Jun 2018
CVE-2017-2624 Open this link in a new tabHow to fix?
Upgrade Debian:9
xorg-server
to version 2:1.19.2-1 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 Debian
.
See How to fix?
for Debian:9
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
- https://security-tracker.debian.org/tracker/CVE-2017-2624
- https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
- 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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-2624