CVE Vulnerability

CVE-2021-31535

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.

7.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.8 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

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

Configuration 1

cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Information

Published : 2021-05-27 01:15

Updated : 2021-09-23 12:45

NVD link : CVE-2021-31535

Mitre link : CVE-2021-31535

Products Affected
No products.
CWE
CWE-120