CVE-2022-35926 Explained : Impact and Mitigation
Learn about CVE-2022-35926 involving an out-of-bounds read vulnerability in Contiki-NG's IPv6 neighbor solicitation. Understand the impact, affected versions, and mitigation steps.
Contiki-NG, an open-source operating system for IoT devices, was found to have a vulnerability in IPv6 neighbor solicitation. Attackers could exploit this issue to trigger an out-of-bounds read due to insufficient validation of IPv6 neighbor discovery options.
Understanding CVE-2022-35926
This CVE involves an out-of-bounds read vulnerability in Contiki-NG's IPv6 neighbor solicitation, impacting versions below 4.8.
What is CVE-2022-35926?
The vulnerability in Contiki-NG's IPv6 neighbor solicitation allows attackers to exploit insufficient validation of IPv6 neighbor discovery options, leading to an out-of-bounds read in the uip-nd6.c module.
The Impact of CVE-2022-35926
With a CVSS base score of 5.9 (medium severity), this vulnerability poses a high availability impact. Attackers can exploit this issue over a network without requiring privileges.
Technical Details of CVE-2022-35926
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability arises from inadequate validation of IPv6 neighbor discovery options, enabling attackers to trigger an out-of-bounds read in Contiki-NG's uip-nd6.c module.
Affected Systems and Versions
Contiki-NG versions below 4.8 are affected by this vulnerability.
Exploitation Mechanism
Attackers can send neighbor solicitation packets with specific options, causing the uip-nd6.c module to perform out-of-bounds memory reads.
Mitigation and Prevention
To address CVE-2022-35926, immediate and long-term security measures are essential.
Immediate Steps to Take
Users are advised to upgrade to Contiki-NG version 4.8 or apply the patch available in PR #1654 if an upgrade is not immediately feasible.
Long-Term Security Practices
Implement strict input validation mechanisms and regularly update software to prevent similar vulnerabilities. Follow security best practices for IoT device deployments.
Patching and Updates
The issue has been patched in the develop branch of Contiki-NG, and the fix will be included in the upcoming 4.8 release.