Contiki-NG up to 4.8/4.9 BLE L2CAP PACKETBUF_SIZE buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Contiki-NG up to 4.8/4.9. Affected by this vulnerability is an unknown functionality of the component BLE L2CAP Module. The manipulation of the argument PACKETBUF_SIZE results in buffer overflow. This vulnerability is cataloged as CVE-2023-28116. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Contiki-NG up to 4.8/4.9. Affected is some unknown functionality of the component BLE L2CAP Module. The manipulation of the argument PACKETBUF_SIZE with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Contiki-NG is an open-source, cross-platform operating system for internet of things (IoT) devices. In versions 4.8 and prior, an out-of-bounds write can occur in the BLE L2CAP module of the Contiki-NG operating system. The network stack of Contiki-NG uses a global buffer (packetbuf) for processing of packets, with the size of PACKETBUF_SIZE. In particular, when using the BLE L2CAP module with the default configuration, the PACKETBUF_SIZE value becomes larger then the actual size of the packetbuf. When large packets are processed by the L2CAP module, a buffer overflow can therefore occur when copying the packet data to the packetbuf. The vulnerability has been patched in the "develop" branch of Contiki-NG, and will be included in release 4.9. The problem can be worked around by applying the patch manually.

The weakness was shared 03/18/2023 as GHSA-m737-4vx6-pfqp. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2023-28116 since 03/10/2023. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/11/2023).

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
• 4.9

License

• open-source

Website

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

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