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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA IPsec Parsing Flaw Lets Remote Authenticated Users Cause the Target System to Reload
SecurityTracker Alert ID:  1038316
SecurityTracker URL:  http://securitytracker.com/id/1038316
CVE Reference:   CVE-2017-6609   (Links to External Site)
Date:  Apr 20 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco ASA. A remote authenticated user can cause the target system to reload.

A remote authenticated user with a valid IPsec tunnel can send specially crafted IPsec packets to the target system to trigger a parsing error and cause the target system to reload.

Systems configured in routed firewall mode only and in single or multiple context mode are affected.

The following models are affected:

ASA 1000V Cloud Firewall
ASA 5500 Series Adaptive Security Appliances
ASA 5500-X Series Next-Generation Firewalls
ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
Adaptive Security Virtual Appliance (ASAv)
Firepower 9300 ASA Security Module
ISA 3000 Industrial Security Appliance

Systems configured to terminate only Clientless SSL or AnyConnect SSL VPNs are not affected.

The vendor has assigned bug ID CSCun16158 to this vulnerability.

Impact:   A remote authenticated user can cause the target system to reload.
Solution:   The vendor has issued a fix (9.1(7.8), 9.2(4.15), 9.4(4), 9.5(3.2), 9.6(2)).

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-asa-ipsec

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-asa-ipsec (Links to External Site)
Cause:   Input validation error

Message History:   None.


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