CVE-2022-35926: Out-of-bounds read in IPv6 neighbor solicitation in Contiki-NG
First published: Thu Aug 04 2022(Updated: )
Contiki-NG is an open-source, cross-platform operating system for IoT devices. Because of insufficient validation of IPv6 neighbor discovery options in Contiki-NG, attackers can send neighbor solicitation packets that trigger an out-of-bounds read. The problem exists in the module os/net/ipv6/uip-nd6.c, where memory read operations from the main packet buffer, <code>uip_buf</code>, are not checked if they go out of bounds. In particular, this problem can occur when attempting to read the 2-byte option header and the Source Link-Layer Address Option (SLLAO). This attack requires ipv6 be enabled for the network. The problem has been patched in the develop branch of Contiki-NG. The upcoming 4.8 release of Contiki-NG will include the patch.Users unable to upgrade may apply the patch in Contiki-NG PR #1654.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Contiki-ng Contiki-ng | <4.8 |
Remedy
https://github.com/contiki-ng/contiki-ng/pull/1654/commits/a4597001d50a04f4b9c78f323ba731e2f979802c
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Reference Links
Frequently Asked Questions
What is CVE-2022-35926?
CVE-2022-35926 is a vulnerability in Contiki-NG, an open-source cross-platform operating system for IoT devices.
What is the severity of CVE-2022-35926?
The severity of CVE-2022-35926 is high with a CVSS score of 7.5.
What is the affected software for CVE-2022-35926?
The affected software for CVE-2022-35926 is Contiki-NG version 4.8 and below.
How can this vulnerability be exploited?
Attackers can exploit CVE-2022-35926 by sending neighbor solicitation packets with insufficiently validated IPv6 neighbor discovery options, triggering an out-of-bounds read.
How can I fix CVE-2022-35926?
To fix CVE-2022-35926, it is recommended to update to a version of Contiki-NG that is not affected, such as version 4.9 or later.
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