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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Lets Remote Users Bypass uRPF Validation on the Target System
SecurityTracker Alert ID:  1033265
SecurityTracker URL:  http://securitytracker.com/id/1033265
CVE Reference:   CVE-2015-4321   (Links to External Site)
Date:  Aug 13 2015
Impact:   Host/resource access via network
Vendor Confirmed:  Yes  
Version(s): 9.3(1.50), 9.3(2.100), 9.3(3), 9.4(1); possibly other versions
Description:   A vulnerability was reported in Cisco ASA. A remote user can bypass security controls on the target system.

The system does not properly drop packets originating from an outside interface with an IP address that is both in the ASA routing table and associated with an internal interface. A remote user can send specially crafted spoofed IP packets to the target device in a subnet range that should be dropped to trigger a flaw in the Unicast Reverse Path Forwarding (uRPF) feature and bypass the uRPF validation checks. As a result, the packets will be forwarded on the internal network.

The vendor has assigned bug ID CSCuv60724 to this vulnerability.

Impact:   A remote user can bypass the uRPF validation checks to cause packets to forwarded on the internal network.
Solution:   No solution was available at the time of this entry.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/viewAlert.x?alertId=40440

Vendor URL:  tools.cisco.com/security/center/viewAlert.x?alertId=40440 (Links to External Site)
Cause:   State error

Message History:   None.


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