CVE-2023-40184

2023-08-3000:00:00

ubuntu.com

xrdp

rdp server

session restriction

pam

upgrade

cve-2023-40184

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

49.9%

JSON

xrdp is an open source remote desktop protocol (RDP) server. In versions
prior to 0.9.23 improper handling of session establishment errors allows
bypassing OS-level session restrictions. The auth_start_session function
can return non-zero (1) value on, e.g., PAM error which may result in in
session restrictions such as max concurrent sessions per user by PAM (ex
./etc/security/limits.conf) to be bypassed. Users (administrators) don’t
use restrictions by PAM are not affected. This issue has been addressed in
release version 0.9.23. Users are advised to upgrade. There are no known
workarounds for this issue.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchxrdp< 0.9.5-2ubuntu0.1~esm2UNKNOWN
ubuntu20.04noarchxrdp< 0.9.12-1ubuntu0.1+esm1UNKNOWN
ubuntu22.04noarchxrdp< 0.9.17-2ubuntu2+esm1UNKNOWN
ubuntu24.04noarchxrdp< anyUNKNOWN
ubuntu14.04noarchxrdp< 0.6.0-1ubuntu0.1+esm3UNKNOWN
ubuntu16.04noarchxrdp< 0.6.1-2ubuntu0.3+esm3UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	xrdp	< 0.9.5-2ubuntu0.1~esm2	UNKNOWN
ubuntu	20.04	noarch	xrdp	< 0.9.12-1ubuntu0.1+esm1	UNKNOWN
ubuntu	22.04	noarch	xrdp	< 0.9.17-2ubuntu2+esm1	UNKNOWN
ubuntu	24.04	noarch	xrdp	< any	UNKNOWN
ubuntu	14.04	noarch	xrdp	< 0.6.0-1ubuntu0.1+esm3	UNKNOWN
ubuntu	16.04	noarch	xrdp	< 0.6.1-2ubuntu0.3+esm3	UNKNOWN