#VU84373 Integer overflow in X.org Server and Xwayland - CVE-2023-6478

Vulnerability identifier: #VU84373

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-6478

CWE-ID: CWE-190

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
X.org Server
Server applications / Other server solutions
Xwayland
Client/Desktop applications / Multimedia software

Vendor: X.org

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to integer overflow when handling RRChangeProviderProperty or RRChangeOutputProperty requests. A local user can send a specially crafted request to the server, trigger an integer overflow and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

X.org Server: 1.4 - 21.1.9

Xwayland: 21.0.99.901 - 23.2.2

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External links
http://www.mail-archive.com/xorg-announce@lists.x.org/msg01644.html
http://www.zerodayinitiative.com/advisories/ZDI-24-009/

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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.