RIOT-OS prior 2022.10 6LoWPAN Frame out-of-bounds write

Summaryinfo

A vulnerability was found in RIOT-OS. It has been classified as critical. Impacted is an unknown function of the component 6LoWPAN Frame Handler. The manipulation leads to out-of-bounds write. This vulnerability is traded as CVE-2023-24823. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in RIOT-OS and classified as very critical. This issue affects an unknown code block of the component 6LoWPAN Frame Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

RIOT-OS, an operating system that supports Internet of Things devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to version 2022.10, an attacker can send a crafted frame to the device resulting in a type confusion between IPv6 extension headers and a UDP header. This occurs while encoding a 6LoWPAN IPHC header. The type confusion manifests in an out of bounds write in the packet buffer. The overflow can be used to corrupt other packets and the allocator metadata. Corrupting a pointer will easily lead to denial of service. While carefully manipulating the allocator metadata gives an attacker the possibility to write data to arbitrary locations and thus execute arbitrary code. Version 2022.10 fixes this issue. As a workaround, apply the patches manually.

The weakness was shared 04/24/2023 as GHSA-jwmv-47p2-hgq2. The advisory is shared at github.com. The identification of this vulnerability is CVE-2023-24823 since 01/30/2023. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/24/2023).

Upgrading to version 2022.10 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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• RIOT-OS

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