CVE-2017-2624

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.

Score

CVSS 3.0 7.0 High

Status

Modified - secalert@redhat.com

Published

2018-07-27

Last modified

2024-08-05

Weaknesses

CWE-200, CWE-385

Affected products

• Debian Linux (Debian)
• X Server (X.org)
• Xorg-x11-server (Xorg)

References

• http://www.securityfocus.com/bid/96480
• http://www.securitytracker.com/id/1037919
• https://bugzilla.redhat.com/show_bug.cgi?id=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/