CVE-2021-31535

Name
CVE-2021-31535
Description
LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.
NVD Severity
high
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
MISC https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/
MISC https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt
MISC https://lists.freedesktop.org/archives/xorg/
MISC https://www.openwall.com/lists/oss-security/2021/05/18/2
MISC https://www.openwall.com/lists/oss-security/2021/05/18/3
Vendor Advisory https://lists.x.org/archives/xorg-announce/2021-May/003088.html
Third Party Advisory https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html
Exploit http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html
Third Party Advisory https://www.debian.org/security/2021/dsa-4920
Mailing List http://www.openwall.com/lists/oss-security/2021/05/18/2
Third Party Advisory https://security.gentoo.org/glsa/202105-16
Mailing List http://seclists.org/fulldisclosure/2021/May/52
Third Party Advisory https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605
Third Party Advisory https://security.netapp.com/advisory/ntap-20210813-0001/
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/
Mailing List https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cusers.kafka.apache.org%3E
Mailing List https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cdev.kafka.apache.org%3E
Mailing List https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cusers.kafka.apache.org%3E
Mailing List https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cdev.kafka.apache.org%3E

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:* libx11 >= None < 1.7.1
cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:* x_window_system >= None <= x11r7.7

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
libx11 3.13-main 1.7.1-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
libx11 3.12-main 1.6.12-r1 Natanael Copa <ncopa@alpinelinux.org> fixed
libx11 3.11-main 1.6.12-r1 Natanael Copa <ncopa@alpinelinux.org> fixed
libx11 3.10-main 1.6.12-r1 Natanael Copa <ncopa@alpinelinux.org> fixed