Contiki-NG up to 4.8 BLE-L2CAP out-of-bounds write

Summaryinfo

A vulnerability was found in Contiki-NG up to 4.8. It has been classified as critical. The affected element is an unknown function of the component BLE-L2CAP Module. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2023-23609. The attacker must have access to the local network to execute the attack. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Contiki-NG up to 4.8. This affects an unknown code block of the component BLE-L2CAP Module. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed 01/27/2023 as GHSA-qr4q-6h3m-h3g7. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-23609 since 01/16/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 4.9 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Contiki-NG

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8

License

• open-source

Website

• Product: https://github.com/contiki-ng/contiki-ng/

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