// For flags

CVE-2022-41873

Out-of-bounds read and write in BLE L2CAP module

Severity Score

5.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. Versions prior to 4.9 are vulnerable to an Out-of-bounds read. While processing the L2CAP protocol, the Bluetooth Low Energy stack of Contiki-NG needs to map an incoming channel ID to its metadata structure. While looking up the corresponding channel structure in get_channel_for_cid (in os/net/mac/ble/ble-l2cap.c), a bounds check is performed on the incoming channel ID, which is meant to ensure that the channel ID does not exceed the maximum number of supported channels.However, an integer truncation issue leads to only the lowest byte of the channel ID to be checked, which leads to an incomplete out-of-bounds check. A crafted channel ID leads to out-of-bounds memory to be read and written with attacker-controlled data. The vulnerability has been patched in the "develop" branch of Contiki-NG, and will be included in release 4.9. As a workaround, Users can apply the patch in Contiki-NG pull request 2081 on GitHub.

Contiki-NG es un sistema operativo multiplataforma de código abierto para dispositivos Next-Generation IoT. Las versiones anteriores a la 4.9 son vulnerables a una lectura fuera de los límites. Mientras procesa el protocolo L2CAP, la pila Bluetooth Low Energy de Contiki-NG necesita asignar un ID de canal entrante a su estructura de metadatos. Mientras se busca la estructura del canal correspondiente en get_channel_for_cid (en os/net/mac/ble/ble-l2cap.c), se realiza una verificación de los límites en el ID del canal entrante, cuyo objetivo es garantizar que el ID del canal no exceda el número máximo de canales admitidos. Sin embargo, un problema de truncamiento de enteros hace que solo se verifique el byte más bajo del ID del canal, lo que genera una verificación fuera de los límites incompleta. Una ID de canal manipulada conduce a una memoria fuera de los límites para leer y escribir con datos controlados por el atacante. La vulnerabilidad ha sido parcheada en la rama "develop" de Contiki-NG y se incluirá en la versión 4.9. Como workaround, los usuarios pueden aplicar el parche en la solicitud de extracción 2081 de Contiki-NG en GitHub.

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-09-30 CVE Reserved
  • 2022-11-11 CVE Published
  • 2024-06-03 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-125: Out-of-bounds Read
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Contiki-ng
Search vendor "Contiki-ng"
 Contiki-ng
Search vendor "Contiki-ng" for product "Contiki-ng"
 < 4.9
Search vendor "Contiki-ng" for product "Contiki-ng" and version " < 4.9"
-
Affected