CVE-2022-20943
MediumCVSS 5.8Exploitation Probability (EPSS)
Elevated risk56th percentile - higher than 56% of all known CVEs
Summary
Multiple vulnerabilities in the 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. This is due to improper management of system resources when processing SMB2 traffic. An attacker could send a high rate of SMB2 packets to trigger a reload of the Snort process. With preserve-connection enabled (default), policy bypass and malicious payload delivery are also possible.
Risk Assessment
The risk is the potential for Snort process disruption (DoS) and policy bypass, potentially leading to malware delivery to the protected network.
Recommendation
It is recommended to update products with Snort 3 to a patched version and consider disabling preserve-connection if not required.
Original NVD description (English source)
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.