// For flags

CVE-2021-21367

Incorrect Authorization in switchboard-plug-bluetooth

Severity Score

8.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Switchboard Bluetooth Plug for elementary OS from version 2.3.0 and before version version 2.3.5 has an incorrect authorization vulnerability. When the Bluetooth plug is running (in discoverable mode), Bluetooth service requests and pairing requests are automatically accepted, allowing physically proximate attackers to pair with a device running an affected version of switchboard-plug-bluetooth without the active consent of the user. By default, elementary OS doesn't expose any services via Bluetooth that allow information to be extracted by paired Bluetooth devices. However, if such services (i.e. contact list sharing software) have been installed, it's possible that attackers have been able to extract data from such services without authorization. If no such services have been installed, attackers are only able to pair with a device running an affected version without authorization and then play audio out of the device or possibly present a HID device (keyboard, mouse, etc...) to control the device. As such, users should check the list of trusted/paired devices and remove any that are not 100% confirmed to be genuine. This is fixed in version 2.3.5. To reduce the likelihood of this vulnerability on an unpatched version, only open the Bluetooth plug for short intervals when absolutely necessary and preferably not in crowded public areas. To mitigate the risk entirely with unpatched versions, do not open the Bluetooth plug within switchboard at all, and use a different method for pairing devices if necessary (e.g. `bluetoothctl` CLI).

Switchboard Bluetooth Plug para el SO elementary desde la versión 2.3.0 y versiones anteriores a 2.3.5, presenta una vulnerabilidad de autorización incorrecta. Cuando Bluetooth plug se está ejecutando (en modo detectable), unas peticiones de servicio de Bluetooth y las peticiones de emparejamiento se aceptan automáticamente, lo que permite a atacantes cercanos físicamente emparejarse con un dispositivo que ejecuta una versión afectada de switchboard-plug-bluetooth sin el consentimiento activo del usuario. De forma predeterminada, el Sistema Operativo elementary no expone ningún servicio por medio de Bluetooth que permita que los dispositivos Bluetooth emparejados extraigan información. Sin embargo, si se han instalado dichos servicios (es decir, software para compartir listas de contactos), es posible que los atacantes han sido capaces de extraer datos de dichos servicios sin autorización. Si no se han instalado tales servicios, los atacantes solo pueden emparejarse con un dispositivo que ejecuta una versión afectada sin autorización y luego reproducir audio desde el dispositivo o posiblemente presentar un dispositivo HID (teclado, mouse, etc.) para controlar el dispositivo. Como tal, los usuarios deben verificar la lista de dispositivos confiables, emparejados y eliminar los que no estén 100% confirmados como genuinos. Esto es corregido en la versión 2.3.5. Para reducir la probabilidad de esta vulnerabilidad en una versión sin parches, solo abra el plug de Bluetooth durante intervalos cortos cuando sea absolutamente necesario y preferiblemente no en áreas públicas concurridas. Para mitigar el riesgo por completo con las versiones no parcheadas, no abra el plug de Bluetooth dentro de la switchboard y use un método diferente para emparejar dispositivos si es necesario (por ejemplo, CLI "bluetoothctl")

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
Low
Attack Vector
Adjacent
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-03-12 CVE Published
  • 2023-11-26 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-863: Incorrect Authorization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Elementary
Search vendor "Elementary"
Switchboard Bluetooth Plug
Search vendor "Elementary" for product "Switchboard Bluetooth Plug"
>= 2.3.0 < 2.3.5
Search vendor "Elementary" for product "Switchboard Bluetooth Plug" and version " >= 2.3.0 < 2.3.5"
elementary_os
Affected
Fedoraproject
Search vendor "Fedoraproject"
Fedora
Search vendor "Fedoraproject" for product "Fedora"
32
Search vendor "Fedoraproject" for product "Fedora" and version "32"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
Fedora
Search vendor "Fedoraproject" for product "Fedora"
33
Search vendor "Fedoraproject" for product "Fedora" and version "33"
-
Affected