Use-after-free in X.org Server

1) Use-after-free

EUVDB-ID: #VU74180

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-1393

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when processing deletion of a compositor overlay window. A local user can trigger a use-after-free error and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 1.3.0 - 21.1.7

External links

http://gitlab.freedesktop.org/xorg/xserver/-/commit/26ef545b3
http://www.openwall.com/lists/oss-security/2023/03/29/1
http://www.zerodayinitiative.com/advisories/ZDI-23-359/

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.