SB2020121502 - Red Hat Enterprise Linux 7 update for xorg-x11-server
Published: December 15, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Improper Initialization (CVE-ID: CVE-2020-14347)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local authenticated user to gain access to sensitive information.
A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.
2) Out-of-bounds read (CVE-ID: CVE-2020-14360)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when processing XkbSetMap requests. A local user can trigger an out-of-bounds read error and read contents of memory on the system.
3) Heap-based buffer overflow (CVE-ID: CVE-2020-25712)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within XkbSetDeviceInfo functionality. A local user can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system with elevated privileges.
Remediation
Install update from vendor's website.