PT-2022-6189 · Cisco · Cisco Umbrella+3

Published 2022-11-09 · Updated 2024-01-25 · CVE-2022-20943

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions Cisco Firepower Threat Defense (FTD) versions with Snort 3 configured Cisco Meraki MX versions with Snort 3 configured Cisco Cyber Vision versions with Snort 3 configured Cisco Umbrella versions with Snort 3 configured

Description Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine 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. If the snort preserve-connection option is enabled, a successful exploit could also allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.

Recommendations For Cisco Firepower Threat Defense (FTD) versions with Snort 3 configured, consider disabling the Snort 3 configuration until a patch is available. For Cisco Meraki MX versions with Snort 3 configured, restrict access to the Snort detection engine to minimize the risk of exploitation. For Cisco Cyber Vision versions with Snort 3 configured, avoid using the Snort detection engine for SMB2 traffic until the issue is resolved. For Cisco Umbrella versions with Snort 3 configured, as a temporary workaround, consider disabling the snort preserve-connection option until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-244

Related Identifiers

BDU:2023-00363

CVE-2022-20943

Affected Products

Cisco Cyber Vision

Cisco Ftd

Cisco Meraki Mx

Cisco Umbrella

References · 6

• https://osv.dev/vulnerability/CVE-2022-20943 · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-smb-3nfhJtr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-20943 · Security Note
• https://bdu.fstec.ru/vul/2023-00363 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-smb-3nfhJtr · Note
• https://t.me/cvenotify/37806 · Telegram Post