SB2022010420 - CentOS 7 update for xorg-x11-server
Published: January 4, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2021-4008)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SProcRenderCompositeGlyphs() function in the Render extension. A local user can send a specially crafted CompositeGlyphs request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
2) Out-of-bounds write (CVE-ID: CVE-2021-4009)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the ProcXFixesCreatePointerBarrier() function in the XFixes extension. A local user can send a specially crafted CreatePointerBarrier request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
3) Out-of-bounds write (CVE-ID: CVE-2021-4010)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SProcScreenSaverSuspend() function in the Screen Saver extension. A local user can send a specially crafted Suspend request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
4) Out-of-bounds write (CVE-ID: CVE-2021-4011)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SwapCreateRegister() function in the Record extension. A local user can send a specially crafted RecordCreateContext and RecordRegisterClients requests, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.