Privilege escalation in X.org server

1) Security restrictions bypass

EUVDB-ID: #VU48239

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25697

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way X.org server handles authentication requests. A local user can impersonate the X.org server and trick the victim into providing credentials to a rouge application under attackers control.

Mitigation

Install update from vendor's website.

Vulnerable software versions

X.org Server: 1.3.0 - 1.91.2

External links

http://seclists.org/oss-sec/2020/q4/105

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.