Behavior of the ASA

Hello

I wonder how ASA 8.4 handle continued the situation:

1 IPSEC-L2L tunnel is in place

2. "no sysopt permit vpn connection" is used, ACL applied to the outside entering for the remote VPN hosts to filter the VPN traffic

3. IP addresses are used for crypto-field at both ends of the VPN L2L

What happens if a package intended to be encrypted (IP source addresses and destination are part of the crypto field) arrives on the external interface of the ASA in the clear? ASA will pass, after reviewing the encryption card deciding that this package should have arrived encrypted or any simply permit it seeks external ACL (a not crypto)?

Thank you!

The ASA will drop this package. If the packet matches the reverse crypto-definition must arrive in encrypted form. After decryption, the packet is compared to the outside interface.

This old behavior (no sysopt permit vpn connection)) had a security problem as a malicious service provider was able to send the traffic on your network:

If you have dynamic branches, you need a dynamic crypto map. The dynamic crypto map was completed the connection time of the branch with the cryptographic-ID proxy. And in the external ACL traffic (typically from RFC1918 in RFC1918) traffic was permitted.

If the VPN tunnel was not upward, the PIX was not aware of the crypto-definition. But in clear text communication was still allowed in the ACL interface. If the service provider would rout the packets with addresses for the PIX, the traffic has beed accepted but which was never to be received in clear text.

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Tags: Cisco Security

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