CVE-2023-50926: Unvalidated DIO prefix info length in RPL-Lite in Contiki-NG
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be caused by an incoming DIO message when using the RPL-Lite implementation in the Contiki-NG operating system. More specifically, the prefix information of the DIO message contains a field that specifies the length of an IPv6 address prefix. The value of this field is not validated, which means that an attacker can set a value that is longer than the maximum prefix length. Subsequently, a memcmp function call that compares different prefixes can be called with a length argument that surpasses the boundary of the array allocated for the prefix, causing an out-of-bounds read. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. Users are advised to update as soon as they are able to or to manually apply the changes in Contiki-NG pull request #2721.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2023-50926?
CVE-2023-50926 has been classified as a medium severity vulnerability due to potential security risks from an out-of-bounds read.
How do I fix CVE-2023-50926?
To address CVE-2023-50926, update your Contiki-NG software to a version later than 4.9 where the vulnerability has been patched.
Who is affected by CVE-2023-50926?
CVE-2023-50926 affects users of the Contiki-NG operating system running versions up to and including 4.9.
What causes CVE-2023-50926?
CVE-2023-50926 is caused by an out-of-bounds read initiated by an incoming DIO message in the RPL-Lite implementation of the Contiki-NG OS.
Is there a workaround for CVE-2023-50926?
While the best solution is to upgrade, users may also limit network exposure as a temporary workaround for CVE-2023-50926.