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CVE-2023-42822

Published: 27 September 2023

xrdp is an open source remote desktop protocol server. Access to the font glyphs in xrdp_painter.c is not bounds-checked . Since some of this data is controllable by the user, this can result in an out-of-bounds read within the xrdp executable. The vulnerability allows an out-of-bounds read within a potentially privileged process. On non-Debian platforms, xrdp tends to run as root. Potentially an out-of-bounds write can follow the out-of-bounds read. There is no denial-of-service impact, providing xrdp is running in forking mode. This issue has been addressed in release 0.9.23.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
xrdp
Launchpad, Ubuntu, Debian
trusty
Released (0.6.0-1ubuntu0.1+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (0.9.5-2ubuntu0.1~esm2)
Available with Ubuntu Pro
focal
Released (0.9.12-1ubuntu0.1+esm1)
Available with Ubuntu Pro
jammy
Released (0.9.17-2ubuntu2+esm1)
Available with Ubuntu Pro
lunar Ignored
(end of life, was needs-triage)
upstream
Released (0.9.23)
mantic Needs triage

xenial
Released (0.6.1-2ubuntu0.3+esm3)
Available with Ubuntu Pro
Patches:
upstream: https://github.com/neutrinolabs/xrdp/commit/73acbe1f7957c65122b00de4d6f57a8d0d257c40

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N