CVE-2022-20922 : Vulnerability Insights and Analysis
Learn about CVE-2022-20922, multiple vulnerabilities in Cisco products' Snort detection engine, allowing attackers to bypass policies or cause DoS attacks.
Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine on multiple Cisco products could allow an unauthenticated, remote attacker to bypass configured policies or cause a denial of service (DoS) condition.
Understanding CVE-2022-20922
These vulnerabilities in the Snort detection engine can lead to system resource mismanagement when processing SMB2 traffic, enabling attackers to initiate a DoS attack.
What is CVE-2022-20922?
The CVE-2022-20922 involves improper handling of certain SMB2 packets by the Snort detection engine, leading to a potential DoS exploit and policy bypass on affected Cisco products.
The Impact of CVE-2022-20922
Successful exploitation could trigger a reload of the Snort process, causing a DoS. Attackers can bypass configured policies, delivering malicious payloads to the network if the snort preserve-connection option is enabled, affecting mainly Snort 3 configured products.
Technical Details of CVE-2022-20922
Vulnerability Description
The vulnerabilities stem from inefficient system resource management during SMB2 traffic processing, allowing for DoS attacks and policy bypasses when the Snort detection engine is in use.
Affected Systems and Versions
Products such as Cisco Firepower Threat Defense Software, Cisco Umbrella Insights Virtual Appliance, and Cisco Cyber Vision configured with Snort 3 are impacted across various versions.
Exploitation Mechanism
Exploitation involves sending a high rate of specific SMB2 packets through affected devices, triggering Snort process reloads and potential DoS conditions.
Mitigation and Prevention
Immediate Steps to Take
Users are advised to apply security updates promptly, disable the snort preserve-connection option, and monitor network traffic for any anomalies.
Long-Term Security Practices
Implement network segmentation, access controls, and ongoing security monitoring to mitigate the risk of DoS attacks and unauthorized policy bypasses.
Patching and Updates
Regularly check for security advisories and updates from Cisco affecting Snort 3 configured products to ensure protection against CVE-2022-20922.