description: 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.
problem types: Improper Clearing of Heap Memory Before Release ('Heap Inspection')
affected:
{
vendor: Cisco
product: Cisco Firepower Threat Defense Software
versions:
version: 7.0.0, status: affected
version: 7.0.0.1, status: affected
version: 7.0.1, status: affected
version: 7.0.1.1, status: affected
}
{
vendor: Cisco
product: Cisco Cyber Vision
versions:
version: 3.0.4, status: affected
version: 3.0.0, status: affected
version: 3.0.1, status: affected
version: 3.0.2, status: affected
version: 3.0.3, status: affected
version: 3.0.5, status: affected
version: 3.0.6, status: affected
version: 3.1.0, status: affected
version: 3.1.2, status: affected
version: 3.1.1, status: affected
version: 3.2.3, status: affected
version: 3.2.1, status: affected
version: 3.2.4, status: affected
version: 3.2.0, status: affected
version: 3.2.2, status: affected
version: 4.0.0, status: affected
version: 4.0.1, status: affected
version: 4.0.2, status: affected
version: 4.0.3, status: affected
version: 4.1.0, status: affected
version: 4.1.1, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
baseScore: 5.8
baseSeverity: MEDIUM
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: LOW
]
exploits: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.