Contiki-NG up to 4.8 storage-cfs.c storage_get_index/storage_put_index off-by-one

Summaryinfo

A vulnerability identified as very critical has been detected in Contiki-NG up to 4.8. Affected is the function storage_get_index/storage_put_index of the file os/storage/antelope/storage-cfs.c. Performing a manipulation results in off-by-one. This vulnerability was named CVE-2023-30546. The attack may be initiated remotely. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Contiki-NG up to 4.8. This affects the function storage_get_index/storage_put_index of the file os/storage/antelope/storage-cfs.c. The manipulation with an unknown input leads to a off-by-one vulnerability. CWE is classifying the issue as CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Contiki-NG is an operating system for Internet of Things devices. An off-by-one error can be triggered in the Antelope database management system in the Contiki-NG operating system in versions 4.8 and prior. The problem exists in the Contiki File System (CFS) backend for the storage of data (file os/storage/antelope/storage-cfs.c). In the functions `storage_get_index` and `storage_put_index`, a buffer for merging two strings is allocated with one byte less than the maximum size of the merged strings, causing subsequent function calls to the cfs_open function to read from memory beyond the buffer size. The vulnerability has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. As a workaround, the problem can be fixed by applying the patch in Contiki-NG pull request #2425.

The weakness was presented 04/27/2023 as GHSA-257g-w39m-5jj4. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2023-30546 since 04/12/2023. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/20/2023).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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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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