CVE-2022-41873: Out-of-bounds read and write in BLE L2CAP module
First published: Fri Nov 11 2022(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Contiki-ng Contiki-ng | <4.9 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-41873?
CVE-2022-41873 is a vulnerability in the Contiki-NG operating system that allows for an out-of-bounds read.
How does CVE-2022-41873 affect Contiki-NG?
CVE-2022-41873 affects Contiki-NG versions prior to 4.9 and can be exploited while processing the L2CAP protocol in the Bluetooth Low Energy stack.
What is the severity of CVE-2022-41873?
CVE-2022-41873 has a severity rating of medium, with a CVSS score of 5.4.
How can I fix CVE-2022-41873?
To fix CVE-2022-41873, it is recommended to update Contiki-NG to version 4.9 or newer.
Is there any additional information available about CVE-2022-41873?
Yes, you can find more information about CVE-2022-41873 and its security advisories on the Contiki-NG GitHub page.
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