Red Hat Enterprise Linux 7 update for xorg-x11-server

1) Integer underflow

EUVDB-ID: #VU52197

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3472

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

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

The vulnerability exists due to integer underflow within the XChangeFeedbackControl() function. A local user can run a specially crafted program to trigger integer underflow and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

xorg-x11-server (Red Hat package): 1.20.4-12.el7_9 - 1.20.4-15.el7_9

Red Hat Enterprise Linux for Power, little endian: 7

Red Hat Enterprise Linux for Power, big endian: 7

Red Hat Enterprise Linux for IBM z Systems: 7

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

Red Hat Enterprise Linux Server: 7

External links

http://access.redhat.com/errata/RHSA-2021:2033

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.