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CVE-2023-39356

Published: 31 August 2023

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a missing offset validation may lead to an Out Of Bound Read in the function `gdi_multi_opaque_rect`. In particular there is no code to validate if the value `multi_opaque_rect->numRectangles` is less than 45. Looping through `multi_opaque_rect->`numRectangles without proper boundary checks can lead to Out-of-Bounds Read errors which will likely lead to a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Priority

Medium

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package Release Status
freerdp2
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial Ignored
(end of standard support)
mantic
Released (2.10.0+dfsg1-1.1ubuntu1.1)
bionic
Released (2.2.0+dfsg1-0ubuntu0.18.04.4+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (2.2.0+dfsg1-0ubuntu0.20.04.6)
jammy
Released (2.6.1+dfsg1-3ubuntu2.5)
lunar
Released (2.10.0+dfsg1-1ubuntu0.3)
upstream
Released (2.11.0,3.0.0-beta1)
Patches:
upstream: https://github.com/FreeRDP/FreeRDP/commit/889348a86e49bc8f1351ed6496d847b32db5f86e (2.11.0)
upstream: https://github.com/FreeRDP/FreeRDP/commit/23db2f4e6ba71f1c10c543f24de595d7340adb46 (2.11.1)

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H