CVE-2021-31535 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  9.8 CRITICAL
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html Exploit  Third Party Advisory  VDB Entry 
http://seclists.org/fulldisclosure/2021/May/52 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/05/18/2 Mailing List  Third Party Advisory 
https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605 Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html Third Party Advisory 
https://lists.freedesktop.org/archives/xorg/ Third Party Advisory 
https://lists.x.org/archives/xorg-announce/2021-May/003088.html Vendor Advisory 
https://security.gentoo.org/glsa/202105-16 Third Party Advisory 
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://www.debian.org/security/2021/dsa-4920 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 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-31535
NVD Published Date:
05/27/2021
NVD Last Modified:
06/10/2021
Source:
MITRE