First published: Wed Oct 27 2021(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.
Credit: Cisco was made aware these vulnerabilities through public discussion of the NAT Slipstreaming attacks
Affected Software | Affected Version | How to fix |
---|---|---|
Cisco ASA Software | =9.15<9.15.1.15>=9.13<=9.14<9.14.2.15=9.12<9.12.4.18>=Earlier than 9.8<=9.8<9.8.4.40 | 9.15.1.15 9.14.2.15 9.12.4.18 9.8.4.40 |
Cisco FTD Software | >=6.2.2 and earlier=6.2.3=6.3.0<=6.4.0<6.4.0.12 | 6.4.0.12 |
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The Cisco vulnerability ID for this vulnerability is cisco-sa-natalg-bypass-cpKGqkng.
The severity of cisco-sa-natalg-bypass-cpKGqkng is medium, with a severity value of 4.7.
The affected software for cisco-sa-natalg-bypass-cpKGqkng includes Cisco ASA Software versions 9.15, 9.14, 9.12, and 9.8, as well as Cisco FTD Software versions 6.2.2 and earlier, 6.2.3, 6.3.0, and 6.4.0.
An unauthenticated, remote attacker can exploit cisco-sa-natalg-bypass-cpKGqkng by bypassing the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature, allowing them to open unauthorized connections.
To mitigate the risk of cisco-sa-natalg-bypass-cpKGqkng, it is recommended to update to the specified fixed software versions provided by Cisco.