FreeBSD : xorg-server -- Multiple input validation failures in X server extensions (ffa15b3b-e6f6-11ea-8cbf-54e1ad3d6335)

high Nessus Plugin ID 139832



The remote FreeBSD host is missing one or more security-related updates.


The project reports :

All theses issuses can lead to local privileges elevation on systems where the X server is running privileged.

The handler for the XkbSetNames request does not validate the request length before accessing its contents.

An integer underflow exists in the handler for the XIChangeHierarchy request.

An integer underflow exist in the handler for the XkbSelectEvents request.

An integer underflow exist in the handler for the CreateRegister request of the X record extension.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 139832

File Name: freebsd_pkg_ffa15b3be6f611ea8cbf54e1ad3d6335.nasl

Version: 1.3

Type: local

Published: 8/26/2020

Updated: 9/21/2020

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xephyr, p-cpe:/a:freebsd:freebsd:xorg-dmx, p-cpe:/a:freebsd:freebsd:xorg-nestserver, p-cpe:/a:freebsd:freebsd:xorg-server, p-cpe:/a:freebsd:freebsd:xorg-vfbserver, p-cpe:/a:freebsd:freebsd:xwayland, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 8/25/2020

Vulnerability Publication Date: 8/25/2020

Reference Information

CVE: CVE-2020-14345, CVE-2020-14346, CVE-2020-14361, CVE-2020-14362