// For flags

CVE-2020-4044

Local users can perform a buffer overflow attack against the xrdp-sesman service and then impersonate it

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well.

El servicio xrdp-sesman versiones anteriores a 0.9.13.1 puede ser bloqueado al conectarse a través del puerto 3350 y suministrando una carga maliciosa. Una vez que el proceso xrdp-sesman está inactivo, un atacante sin privilegios en el servidor podría comenzar a iniciar su propio servicio impostor sesman escuchando en el puerto 3350. Esto les permitirá capturar cualquier credencial de usuario que sea enviada a XRDP y aprobar o rechazar credenciales de inicio de sesión arbitrarias. Para las sesiones xorgxrdp en particular, esto permite a un usuario no autorizado secuestrar una sesión existente. Este es un ataque de desbordamiento del búfer, por lo que también puede existir un riesgo de ejecución de código arbitraria

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-12-30 CVE Reserved
  • 2020-06-30 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-121: Stack-based Buffer Overflow
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"
 < 0.9.13.1
Search vendor "Neutrinolabs" for product "Xrdp" and version " < 0.9.13.1"
-
Affected