CVE-2022-20922: Medium severity Cisco Firepower Threat Defense vulnerability
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 the configured policies or cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to improper management of system resources when the Snort detection engine is processing SMB2 traffic. An attacker could exploit these vulnerabilities by sending a high rate of certain types of SMB2 packets through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process, resulting in a DoS condition. Note: When the snort preserve-connection option is enabled for the Snort detection engine, a successful exploit could also allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network. The snort preserve-connection setting is enabled by default. See the Details ["#details"] section of this advisory for more information. Note: Only products that have Snort 3 configured are affected. Products that are configured with Snort 2 are not affected.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Disable the Snort detection engine setting 'snort preserve-connection' (enabled by default) to prevent successful exploits from bypassing configured policies and delivering a malicious payload to the protected network.
Cisco Snort detection engine snort preserve-connection = disable - Compensating control
Ensure only devices with Snort 3 configured are exposed to SMB2 traffic and restrict SMB2 traffic to reduce the ability of an attacker to send a high rate of SMB2 packets to trigger SMB2-processing resource exhaustion and bypass/DoS outcomes.
Event History
Frequently Asked Questions
What is the severity of CVE-2022-20922?
CVE-2022-20922 is considered a high severity vulnerability due to its potential to allow remote attackers to bypass security policies or cause a denial of service.
How do I fix CVE-2022-20922?
To mitigate CVE-2022-20922, it is recommended to update affected Cisco products to the latest versions provided by Cisco.
Which Cisco products are affected by CVE-2022-20922?
CVE-2022-20922 affects various versions of Cisco Firepower Threat Defense, Cisco Umbrella Insights Virtual Appliance, and Cisco Cyber Vision.
Can CVE-2022-20922 be exploited remotely?
Yes, CVE-2022-20922 can be exploited by unauthenticated remote attackers.
What are the potential impacts of CVE-2022-20922 on my network?
Exploitation of CVE-2022-20922 could lead to security policy bypass or a denial of service condition on affected devices.