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CVE-2023-1393

Published: 29 March 2023

A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.

Notes

AuthorNote
mdeslaur
xorg server is actually the xorg-server package
the xorg package only contains docs
xwayland package contains parts of xorg-server

This is ZDI-CAN-19866
tigervnc needs a no-change rebuild once xorg-server is fixed

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
xorg-server-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Does not exist

xorg-server-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Does not exist

xwayland
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

upstream Needs triage

trusty Does not exist

xenial Does not exist

jammy
Released (2:22.1.1-1ubuntu0.6)
kinetic
Released (2:22.1.3-2ubuntu0.4)
lunar
Released (2:22.1.8-1ubuntu1)
mantic
Released (2:22.1.8-1ubuntu1)
xorg-server
Launchpad, Ubuntu, Debian
trusty Needs triage

upstream
Released (21.1.8)
xenial Needs triage

bionic
Released (2:1.19.6-1ubuntu4.15)
focal
Released (2:1.20.13-1ubuntu1~20.04.8)
jammy
Released (2:21.1.3-2ubuntu2.9)
kinetic
Released (2:21.1.4-2ubuntu1.7)
lunar
Released (2:21.1.7-1ubuntu3)
mantic
Released (2:21.1.7-1ubuntu3)
Patches:
upstream: https://gitlab.freedesktop.org/xorg/xserver/-/commit/26ef545b3
xorg-server-hwe-16.04
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Needs triage

xenial Needs triage

xorg-server-hwe-18.04
Launchpad, Ubuntu, Debian
bionic
Released (2:1.20.8-2ubuntu2.2~18.04.11)
focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

xorg-server-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Does not exist

xorg-server-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Does not exist

tigervnc
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial Ignored
(end of standard support)
bionic Needs triage

upstream Needs triage

focal
Released (1.10.1+dfsg-3ubuntu0.20.04.1)
jammy
Released (1.12.0+dfsg-4ubuntu0.22.04.1)
lunar
Released (1.12.0+dfsg-8ubuntu0.23.04.1)
mantic
Released (1.12.0+dfsg-8ubuntu0.23.10.1)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H