#VU46027 Double Free in libx11 - CVE-2020-14363

Vulnerability identifier: #VU46027

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-14363

CWE-ID: CWE-415

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
libx11
Other software / Other software solutions

Vendor: xorg.freedesktop.org

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when handling locales in LibX11. A local user can run a specially crafted program to trigger integer overflow and double free and execute arbitrary code on the system with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libx11: 1.6.0 - 1.6.11

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External links
https://seclists.org/oss-sec/2020/q3/135

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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.