CVE-2023-23609: contiki-ng BLE-L2CAP contains Improper size validation of L2CAP frames

Vulnerability summary

CVE-2023-23609 is a high (CVSS 8.2) Out-of-bounds Write vulnerability in contiki-ng. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.7% of scored vulnerabilities.

Timeline

1. 25-01-2023
   PublishedVulnerability first disclosed.
2. 11-03-2025
   Last modifiedVulnerability information updated.

Description

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. Versions prior to and including 4.8 are vulnerable to an out-of-bounds write that can occur in the BLE-L2CAP module. The Bluetooth Low Energy - Logical Link Control and Adaptation Layer Protocol (BLE-L2CAP) module handles fragmentation of packets up the configured MTU size. When fragments are reassembled, they are stored in a packet buffer of a configurable size, but there is no check to verify that the packet buffer is large enough to hold the reassembled packet. In Contiki-NG's default configuration, it is possible that an out-of-bounds write of up to 1152 bytes occurs. The vulnerability has been patched in the "develop" branch of Contiki-NG, and will be included in release 4.9. The problem can be fixed by applying the patch in Contiki-NG pull request #2254 prior to the release of version 4.9.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.