Using ASA5510 AIP-SSM in IDS mode

Hi,
I' ve a Cisco ASA5510 with AIP-SSM and I wold like to use it like a one-armed IDS for connect them to a span port of a switch in my network,
without the traffic passing through the Firewall.
I've try to configure it and connect the interface inside (fast0/1) to the span port, I create the policy for permit all the traffic to the Sensor but it doesn't work, no packet recived on sensor.
somebody can help me?
thanks

Unfortunately you can't use the AIP-SSM in an ASA with a spanning switch like you could with the 4200 series appliances.
The reason is that the ASA was built to be a firewall, and no matter how much of that functionality you turn off, it still needs to see TCP and UDP conversations flowing thru the ASA in order to pass that traffic to the AIP-SSM sensor (I tired very hard to see if I could get around this limitation, but you can't).
The best you can hope to do is put the ASA in-line (I know this reduces reliability) and turn off as much of the firewall configs you can. Then you can promisciously monitor the traffic passing thru teh ASA with teh AIP-SSM.
It's not ideal, but it's the cheapest IPS sensor in Cisco's line up right now.
- Bob

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Block P2P software using ASA-AIP-SSM-20 module

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Hello Paps,
Many thanks for your reply. I was searching the web like crazy for some solutions using IPS and it never occured to me that I could just simply look for the signature files on Cisco website.
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AIP-SSM 10

Hi can any body Tell me how to use the AIP SSM 10 and how to get the license for it , i got its serial number Itself and no service contract is availbale for it

This is a nice doc:
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00807335ca.shtml
For the license, go to:
https://tools.cisco.com/SWIFT/Licensing/PrivateRegistrationServlet?DemoKeys=Y
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I currently have an ASA5510 in routed mode with an AIP-SSM-20.
There is a requirement to use a fibre optic connection between this ASA and another ASA across campus, so the AIP-SSM will have to be removed and replaced with the SSM-4GE. This part should present no issue.
However, this will remove the IPS device, and I still want to use IPS.
So, what I am thinking is to get another ASA5510, install the AIP-SSM, configure ASA for transparent mode and put it in between the inside of the routed ASA and my LAN. The transparent ASA would be functioning strictly as an IPS appliance.
Setup would look something like this:
Internal LAN <> transparent ASA with IPS <> routed ASA <> WAN
Can the AIP-SSM still perform IPS with the ASA in transparent mode?
Is there a way to configure the ASA and AIP-SSM such that traffic to/from a particular server completely bypasses the AIP-SSM?
I have a couple of fileservers that generate heavy traffic and could overload the AIP-SSM.
Regards.

AFAIR, There is no problem to setup AIP in a transparent firewall.
"An ASA in transparent mode can run an AIP. In the event the AIP fails,
the IPS will fail-open and the ASA will continue to pass traffic.
However, if an interface or cable fails, then traffic will stop. You
would need a failover pair to account for this failure event, which
means another ASA and matching AIP."
And no there is no problem to exclude certain hosts/ports/subnets from inspection by IPS via MPF.
http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/ips.html#wp1050744
What I however consider however is if the ASAs 5510 as second tier firewall for 5520s will be enough.
http://www.cisco.com/en/US/products/ps6120/prod_models_comparison.html
HTH,
Marcin

Single AIP-SSM in Cisco ASA Failover Active / Standby Mode

Hi,
I can add single AIP-SSM on Cisco ASA in failover active / standby mode?

No, both units need the same hardware, that includes the installed modules.
Sent from Cisco Technical Support iPad App

IPS Labs using AIP SSM 10

Hi,
Can anybody send me a lab with a scenario for IPS using AIP SSM 10 and and if they could be for both CLI as well as by using ASDM. Also, when I was trying to access IPS using ASDM, I was getting an error message "Error connecting to sensor. Failed to load sensor-Error getting config data from following modules analysisEngine signatureDefinition networkAccess host". Can anybody please give me a solution for it.
Thanks.

Cisco had orginally planned to add a "keep alive" signature to 6.0. but that feature got dropped. The intent was to fire off a signature every few mins as long as the sensor was seeing valid traffic. The absence of seeing this signature should trigger some attention to a downed sensor.
You can write a custom sig, but you have to be able to detect the loss of that event to be of value.

Recovery password of AIP-SSM on ASA5510

Hi all,
I've configured AIP-SSM on ASA5510, the first time log in to sensor, it prompts to change the default password. But the second time, I can't log in with the password which I've changed.
How can I recovery password? Does anyone meet the same problem?
Thanks,
Phuong

From the ASA CLI you will need to re-image/recover the System Image of the SSM:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/csids/csids12/cliguide/cliimage.htm#wp1032373
Putting on the new System Image will reformat the compact flash which winds up erasing your current configuration and also the current passwords.

Best practices for using Normalizer in ASA and in AIP-SSM

Both PIX OS 7.x and IPS 5.x software have a concept of "traffic normalization". PIX OS on ASA can do virtual reassembly, IPS on SSM (so far as I know) can do physical reassembly and fragmentation of IP packets. Also, both ASA and SSM can do TCP normalization. For example, they both can "check inconsistent retransmissions" and protect against "TTL evasion attacks". I realize that PIX OS has only basic normalization functions and the SSM is much more configurable.
The question is: what are the best practices here? Is it better to disable some IP/TCP PIX OS checks / IPS signatures on ASA and/or SSM? Is it better to use just SSM for traffic normalization? Does anybody has personal experience here?
Also, there is a BugID CSCsd04327 - "ASA all out of order packets are dropped when sending to ssm"
"When ips ssm is inline slowness is reported. show service-policy shows that the number of out of order packets reported match exactly the number of no buffer drops (even with queue-limit option). Performance hit is not the result of tcp normalization (on IPS 5.x ssm) in this case, but rather an issue with asa normalizer."
To me it seems to be more logical to have normalization function on the firewall, but there may be drawbacks in doing this.
So, those who're using ASA with SSM, please share your experience.
Thx.

Yes, this is almost correct ;)
TCP SRP (Stream Reassemly Processor) is turned OFF on the SSM and cannot be enabled, contrary to 4200 appliances, but IP FRP (Fragmentation Reassembly Processor) is functioning on the SSM.
The testing of 7.2(1) shows the following:
When you configure "policy-map" to send packets to the SSM the "tcp-map" parameter "queue-limit", which has the value of zero by default, is set to an X (the X is unknown). This means that the ASA now only accepts the TCP segments which are sent in the correct order. More specifically, the gaps in SEQs are not allowed anymore. When for example, the ASA receives a TCP segment which has a SEQ within the window, but the previous TCP segment has been lost, it sends an ACK to the sender to enforce retransmition of the lost segment. As a result the sender retransmits both segments. Only after that the ASA forwards both segments to the SSM. This basically means that SSM always sees in-order TCP segments. That it is why SRP is not needed on the SSM.
There are at least two problems however.
The first problem is the performance impact.
ASA now acts almost like a proxy. And, so far as I know, it doesn't support SACK (Selective ACKs). First, when the ASA does TCP SEQ randomization it doesn't change SEQ values within the SACK TCP Option. This simply breakes SACK. Second, even if you turn randomization mechanism OFF, then, I believe, the ASA will not selectively ACK the lost TCP segments, as it simply doesn't support this mechanism.
The second problem is THE SECURITY HOLE.
By default the ASA doesn't check TCP checksums. The 4200 appliances do check by default. But as we now know the SRP is turned OFF on the SSM... So, this means that SSM module can easily be evaded. The hacker only needs to mix attacking traffic with the random TCP segments that have bad TCP checksum. The SSM module will see the mixture of the two and will not recognize the attack. The target host will drop TCP segments with the bad checksums and see only attacking traffic... This has been successfully verified in the lab.
Of course, this security hole can be closed with the "tcp-map" parameter "checksum-verification", but it will definitely has performance impact.
The last note: All of the above has never been documented by Cisco. So, use at your own risk, etc.
I hope, you will read this message, Marcoa. All of this MUST be documented. Once again, the default behaviour of the ASA opens up a big security hole.
Regards,
Oleg Tipisov,
REDCENTER,
Moscow

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So, I'm pretty new to the AIP-SSM but not to ASA's. It appears that very little of the AIP module config gets copied over to the Stdby AIP, nothing other than what appears in the ASA config (ACL's, etc.). So, do all the config elements particular to the module itself have to be manually reproduced on the Stdby module, either by hand entry or config copies moved between the two?

So in Active/Standby scenarios with AIP-SSM, what is the reasoning for not having a feature for automatically copying over module config changes as with the ASA config?
If there is no good reason, is it on the AIP-SSM road map to provide this feature?
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Do I need two AIP-SSM modules if I am configuring failover?

Is it possible to use a single AIP-SSM module in two ASA's that are configured in Active/Standby mode?
I would like to configure the module in the first ASA with the fail-open setting. Then, if the first ASA fails, I could then physically remove the AIP-SSM module and place it in the second ASA.
Would there be any problems configuring it this way?
Would the active/standby ASA's complain that there is only one AIP-SSM module?
Thanks in advance.

Hello Julio. My name is Rogelio, and I would appreciate your answer on a related matter, because I will have to execute the initial configuration of a failover pair, each one with its own IPS module.
Question: let´s suppose that I execute a basic setup (admin username/password, IP address, mask, gateway), on the IPS module of the active ASA firewall. ¿Will this configuration be replicated to the IPS module of the secondary unit?
Your kind answer will be greatly appreciated.
Best regards...

How to buy license? for AIP-SSM-10 ?

Hi all
how to buy license? for AIP-SSM-10 ?
1. CON-SU1-AS1A1PK9 this is Cisco SMARTnet Support for AIP-SSM-10
2. do I need smartnet for ASA ?
3. what is part number of license ?
ASA5510test# session 1
Opening command session with slot 1.
Connected to slot 1. Escape character sequence is 'CTRL-^X'.
login: cisco
Password:
***NOTICE***
This product contains cryptographic features and is subject to United States
and local country laws governing import, export, transfer and use. Delivery
of Cisco cryptographic products does not imply third-party authority to import,
export, distribute or use encryption. Importers, exporters, distributors and
users are responsible for compliance with U.S. and local country laws. By using
this product you agree to comply with applicable laws and regulations. If you
are unable to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
[email protected].
***LICENSE NOTICE***
There is no license key installed on the SSM-IPS10.
The system will continue to operate with the currently installed
signature set. A valid license must be obtained in order to apply
signature updates. Please go to http://www.cisco.com/go/license
to obtain a new license or install a license.
sensor#
sensor# sh ver
Application Partition:
Cisco Intrusion Prevention System, Version 6.0(6)E3
Host:
    Realm Keys          key1.0
Signature Definition:
    Signature Update    S399.0                   2009-05-06
    Virus Update        V1.4                     2007-03-02
OS Version:             2.4.30-IDS-smp-bigphys
Platform:               ASA-SSM-10
Serial Number:          ........
No license present
Sensor up-time is 21 min.
Using 655507456 out of 1032499200 bytes of available memory (63% usage)
application-data is using 39.7M out of 166.8M bytes of available disk space (25%
usage)
boot is using 37.6M out of 68.6M bytes of available disk space (58% usage)
MainApp          N-NUBRA_2009_JUL_15_01_10_6_0_5_57   (Ipsbuild)   2009-07-15T01
:15:08-0500   Running
AnalysisEngine   N-NUBRA_2009_JUL_15_01_10_6_0_5_57   (Ipsbuild)   2009-07-15T01
:15:08-0500   Running
CLI              N-NUBRA_2009_JUL_15_01_10_6_0_5_57   (Ipsbuild)   2009-07-15T01
:15:08-0500
Upgrade History:
IPS-K9-6.0-6-E3   17:48:06 UTC Wed Jul 15 2009
Recovery Partition Version 1.1 - 6.0(6)E3
sensor#

Hi,
CON-SU1-AS2A10K9 contract if for ASA+IPS bundle. If AIP-SSM-10 ws purchased as a spare the contract would be CON-SU1-ASIP10K9.
I am not sure whether or not this Cisco Service for IPS contract can be used to cover just the AIP-SSM-10 if it was purchased as part of a Bundle instead of a Spare.
I would recommend that you check with your Cisco reseller or Cisco Sales Representative.
Sourav

Password Reset for AIP-SSM 10

Hi,
i have an ASA5520 with v 7.2(2) running.
but the IPS module spftware is 5.1
when i tried to login to the > session 1
it prompts me for a login and password.
i tried cisco and a few other combinations.. but no luck ,,
how do i reset it ?? also that reset procedure on the docs says its resets password or the user cisco ..
how can i be sure if the user cisco even exists on it or not ?
any help please ???

no man it doesnt ..
the link u specified says it too..
hw-module module slot_number password-reset?This command recovers a password on a Cisco ASA 5500 Series Content Security and Control Security Services Module (CSC-SSM) or the AIP-SSM without having to re-image the device.
Note: This command starts support from IPS 6.0 (ASA 7.2 version) and is used to restore the Cisco CLI account password to the default cisco
hers my ASA and IPS details..
ASA# sh version
Cisco Adaptive Security Appliance Software Version 7.2(2)
Device Manager Version 5.2(2)
Compiled on Wed 22-Nov-06 14:16 by builders
System image file is "disk0:/asa722-k8.bin"
Config file at boot was "startup-config"
ASA up 22 days 3 hours
Hardware: ASA5520, 512 MB RAM, CPU Pentium 4 Celeron 2000 MHz
ASA# sh module 1
Mod Card Type Model Serial No.
1 ASA5500 SSM-10 ASA-SSM-10 B155670DW4
Mod MAC Add Range Hw Ver. Fw Ver. Sw Ver.
1 00xx to 001 1.0 1.0(10)0 5.0(2)S152.0
Mod SSM Apps. Name Status SSM Apps Version
1 IPS Up 5.0(2)S152.0
Mod Status Data Plane Status Compatibility
1 Up Up

How to block p2p applications(Bittorent like) with AIP-SSM-10?

Hi,
How to block p2p application using AIP-SSM-10 working with ASA5520?AIP is on promiscuous mode.
Thanks,
Siva

There are several signatures that detect p2p, for bit torrent there is 11020.0
Yahoo triggers: 5539.0, 11200.0, 11212.0, 11217.0 & 11219.0
etc..
Some are disabled by default though so please ensure you enable the ones that you need.
If you want to block these then you will have to use event actions that work in promiscuous setup for example request block connection and tcp reset. Please note that care must be taken when using these event actions.
For more information about the event actions please refer the link below:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/csids/csids12/idmguide/dmevtrul.htm#wp1069467

Configuring SNMP Trap receiver on AIP-SSM sensor

I receive the following error message from my ASA5520 firewall when attempting to forward SNMP traps from my AIP-SSM20 sensor to a server on my Inside interface that is configured to receive SNMP traps:
ASA-4-418001: Through-the-device packet to/from management-only network is denied: udp src management: 10.3.21.2/32768 dst Inside: PPC0ES/162
Can I reconfigure the management IP address of the AIP-SSM sensor to connect to the Inside interface instead of the management vlan or does my SNMP server have to reside on the management vlan with the sensor?

Hi Subodh,
Yes, the AIP-SSM can operate in either inline (IPS) or promiscuous (IDS) mode. I would recommend you start by reviewing the following config guide, which shows you how to configure the ASA to pass traffic to the SSM for inspection:
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00807335ca.shtml
If you have any other specific questions, feel free to post back.
Hope that helps.
-Mike

Using ASA5510 AIP-SSM in IDS mode

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