Multiple vulnerabilities in X.org Server and Xwayland

Published: 2023-12-13 | Updated: 2024-01-05

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-6478 CVE-2023-6377
CWE-ID	CWE-190 CWE-787
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	X.org Server Server applications / Other server solutions Xwayland Client/Desktop applications / Multimedia software
Vendor	X.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Integer overflow

EUVDB-ID: #VU84373

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 - Integer overflow

Exploit availability: No

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

CPE2.3

External links

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

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.

2) Out-of-bounds write

EUVDB-ID: #VU84372

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-2023-6377

CWE-ID: CWE-787 - Out-of-bounds write