// For flags

CVE-2023-40184

Improper handling of session establishment errors in xrdp

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

xrdp es un servidor de protocolo de escritorio remoto (RDP) de código abierto. En versiones anteriores a la 0.9.23, el manejo inadecuado de los errores de establecimiento de sesión permite eludir las restricciones de sesión a nivel del sistema operativo. La función `auth_start_session` puede devolver un valor distinto de cero (1), por ejemplo, en un error de PAM, lo que puede dar lugar a restricciones de sesión, como el número máximo de sesiones simultáneas por usuario por parte de PAM (por ejemplo, ./etc/security/limits.conf) para ser omitido. Los usuarios (administradores) que no utilizan restricciones por PAM no se ven afectados. Este problema se solucionó en la versión 0.9.23. Se recomienda a los usuarios que actualicen. No se conocen workarounds para este problema.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-08-09 CVE Reserved
  • 2023-08-30 CVE Published
  • 2024-09-05 EPSS Updated
  • 2024-09-30 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-755: Improper Handling of Exceptional Conditions
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Neutrinolabs
Search vendor "Neutrinolabs"
 Xrdp
Search vendor "Neutrinolabs" for product "Xrdp"
 < 0.9.23
Search vendor "Neutrinolabs" for product "Xrdp" and version " < 0.9.23"
-
Affected