Denial of service in libX11



Published: 2021-05-19 | Updated: 2021-05-19
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-31535
CWE-ID CWE-20
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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libx11
Other software / Other software solutions

Vendor xorg.freedesktop.org

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 19.05.2021

Added additional link to researcher's advisory.

1) Input validation error

EUVDB-ID: #VU53336

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-31535

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of color names within the XLookupColor() function. A local user can run a specially crafted application on the system and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

libx11: 1.0.99.1 - 1.7.0

External links

http://seclists.org/oss-sec/2021/q2/153
http://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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