Contiki-NG up to 4.8 TCP MSS Option os/net/ipv6/uip6.c uip_buf out-of-bounds

Summaryinfo

A vulnerability described as problematic has been identified in Contiki-NG up to 4.8. Affected by this issue is some unknown functionality of the file os/net/ipv6/uip6.c of the component TCP MSS Option Handler. Executing a manipulation of the argument uip_buf can lead to out-of-bounds. This vulnerability is handled as CVE-2023-34100. The attack can be executed remotely. There is not any exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability classified as problematic was found in Contiki-NG up to 4.8. This vulnerability affects an unknown code block of the file os/net/ipv6/uip6.c of the component TCP MSS Option Handler. The manipulation of the argument uip_buf with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

Contiki-NG is an open-source, cross-platform operating system for IoT devices. When reading the TCP MSS option value from an incoming packet, the Contiki-NG OS does not verify that certain buffer indices to read from are within the bounds of the IPv6 packet buffer, uip_buf. In particular, there is a 2-byte buffer read in the module os/net/ipv6/uip6.c. The buffer is indexed using 'UIP_IPTCPH_LEN + 2 + c' and 'UIP_IPTCPH_LEN + 3 + c', but the uip_buf buffer may not have enough data, resulting in a 2-byte read out of bounds. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in release 4.9. Users are advised to watch for the 4.9 release and to upgrade when it becomes available. There are no workarounds for this vulnerability aside from manually patching with the diff in commit `cde4e9839`.

The weakness was released 06/09/2023 as GHSA-3v7c-jq9x-cmph. The advisory is available at github.com. This vulnerability was named CVE-2023-34100 since 05/25/2023. Technical details are known, but there is no available exploit.

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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