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Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities

cisco-sa-natalg-bypass-cpKGqkng · Medium · Published · Updated

Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming.  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng This advisory is part of the October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There are no workarounds that address these vulnerabilities. However, there is a mitigation.

Customers who do not need the SIP or FTP ALG may disable either or both ALGs to reduce the attack surface. This can be accomplished from the CLI for Cisco ASA Software or by using FlexConfig for Cisco FTD Software.

While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2021-34790, CVE-2021-34791
Cisco Bug IDsCSCvw35444, CSCvx50914
CVSS ScoreBase 4.7
Base 4.7 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco Adaptive Security Appliance (ASA) Software 9.8.1, Cisco Adaptive Security Appliance (ASA) Software 9.8.1.5, Cisco Adaptive Security Appliance (ASA) Software 9.8.1.7, Cisco Adaptive Security Appliance (ASA) Software 9.8.2, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.8, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.14, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.15, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.17, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.20, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.24, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.26, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.28, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.33, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.35, Cisco Adaptive Security Appliance (ASA) Software 9.8.2.38, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.8, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.11, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.14, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.16, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.18, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.21, Cisco Adaptive Security Appliance (ASA) Software 9.8.3, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.26, Cisco Adaptive Security Appliance (ASA) Software 9.8.3.29, Cisco Adaptive Security Appliance (ASA) Software 9.8.4, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.3, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.7, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.8, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.10, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.12, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.15, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.17, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.25, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.20, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.22, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.26, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.29, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.32, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.33, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.34, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.35, Cisco Adaptive Security Appliance (ASA) Software 9.8.4.39, Cisco Adaptive Security Appliance (ASA) Software 9.12.1, Cisco Adaptive Security Appliance (ASA) Software 9.12.1.2, Cisco Adaptive Security Appliance (ASA) Software 9.12.1.3, Cisco Adaptive Security Appliance (ASA) Software 9.12.2, Cisco Adaptive Security Appliance (ASA) Software 9.12.2.4, Cisco Adaptive Security Appliance (ASA) Software 9.12.2.5, Cisco Adaptive Security Appliance (ASA) Software 9.12.2.9, Cisco Adaptive Security Appliance (ASA) Software 9.12.3, Cisco Adaptive Security Appliance (ASA) Software 9.12.3.2, Cisco Adaptive Security Appliance (ASA) Software 9.12.3.7, Cisco Adaptive Security Appliance (ASA) Software 9.12.4, Cisco Adaptive Security Appliance (ASA) Software 9.12.3.12, Cisco Adaptive Security Appliance (ASA) Software 9.12.3.9, Cisco Adaptive Security Appliance (ASA) Software 9.12.2.1, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.2, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.4, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.7, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.10, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.13, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.8, Cisco Adaptive Security Appliance (ASA) Software 9.14.1, Cisco Adaptive Security Appliance (ASA) Software 9.14.1.10, Cisco Adaptive Security Appliance (ASA) Software 9.14.1.6, Cisco Adaptive Security Appliance (ASA) Software 9.14.1.15, Cisco Adaptive Security Appliance (ASA) Software 9.14.1.19, Cisco Adaptive Security Appliance (ASA) Software 9.14.1.30, Cisco Adaptive Security Appliance (ASA) Software 9.14.2, Cisco Adaptive Security Appliance (ASA) Software 9.14.2.4, Cisco Adaptive Security Appliance (ASA) Software 9.14.2.8, Cisco Adaptive Security Appliance (ASA) Software 9.14.2.13, Cisco Firepower Threat Defense Software 6.2.3, Cisco Firepower Threat Defense Software 6.2.3.1, Cisco Firepower Threat Defense Software 6.2.3.2, Cisco Firepower Threat Defense Software 6.2.3.3, Cisco Firepower Threat Defense Software 6.2.3.4, Cisco Firepower Threat Defense Software 6.2.3.5, Cisco Firepower Threat Defense Software 6.2.3.6, Cisco Firepower Threat Defense Software 6.2.3.7, Cisco Firepower Threat Defense Software 6.2.3.8, Cisco Firepower Threat Defense Software 6.2.3.10, Cisco Firepower Threat Defense Software 6.2.3.11, Cisco Firepower Threat Defense Software 6.2.3.9, Cisco Firepower Threat Defense Software 6.2.3.12, Cisco Firepower Threat Defense Software 6.2.3.13, Cisco Firepower Threat Defense Software 6.2.3.14, Cisco Firepower Threat Defense Software 6.2.3.15, Cisco Firepower Threat Defense Software 6.2.3.16, Cisco Firepower Threat Defense Software 6.2.3.17, Cisco Firepower Threat Defense Software 6.6.0, Cisco Firepower Threat Defense Software 6.6.0.1, Cisco Firepower Threat Defense Software 6.6.1, Cisco Firepower Threat Defense Software 6.6.3, Cisco Firepower Threat Defense Software 6.6.4, Cisco Firepower Threat Defense Software 6.4.0, Cisco Firepower Threat Defense Software 6.4.0.1, Cisco Firepower Threat Defense Software 6.4.0.3, Cisco Firepower Threat Defense Software 6.4.0.2, Cisco Firepower Threat Defense Software 6.4.0.4, Cisco Firepower Threat Defense Software 6.4.0.5, Cisco Firepower Threat Defense Software 6.4.0.6, Cisco Firepower Threat Defense Software 6.4.0.7, Cisco Firepower Threat Defense Software 6.4.0.8, Cisco Firepower Threat Defense Software 6.4.0.9, Cisco Firepower Threat Defense Software 6.4.0.10, Cisco Firepower Threat Defense Software 6.4.0.11, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Secure Firewall Threat Defense Virtual

Related Products

Product CVE Evidence
Cisco Secure Firewall Threat Defense Virtual CVE-2021-34791 Cisco OpenVuln
Cisco Secure Firewall Threat Defense Virtual CVE-2021-34790 Cisco OpenVuln
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Cisco Secure Firewall Threat Defense (FTD) Software CVE-2021-34790 Cisco OpenVuln
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2021-34791 Cisco OpenVuln
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Cisco Adaptive Security Appliance (ASA) Software CVE-2021-34790 Cisco OpenVuln
Cisco ASA 5500-X Series Firewalls CVE-2021-34791 Cisco OpenVuln
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Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2021-34791 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2021-34790 Cisco OpenVuln