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CVE-2023-40184

Improper handling of session establishment errors in xrdp

Published: Aug 30, 2023Updated: Nov 3, 2025 Sources: CVE List NVD BDUCWE-755
NVD MITRE
2.6CVSSLOW
EPSS Score
0.7%
Top 50.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:RS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-755NVD-CWE-noinfo

Affected Products

Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Альт 8 СПАО «ИВК»
On-premOS
Operating Systems / linux-distro
РОСА КобальтАО «НТЦ ИТ РОСА»
On-prem
Operating Systems / linux-distro
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
ао «ивк»commercialRUOperating Systemsaka ivk
ао «нтц ит роса»commercialRUOperating Systems
and 4 more affected products View all →

Exploitability

Official Patch Available

References

https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
github.com
https://github.com/neutrinolabs/xrdp/commit/25a1fab5b6c5ef2a8bb109232b765cb8b332ce5e
github.com
https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
github.com
and 19 more references View all →

Timeline

Published
Aug 30, 2023
Last Updated
Nov 3, 2025

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