Filtering IPs on a IDS/IPS signature

Forgive me, I am pretty green when it comes to manipulting IDS/IPS signatures.
Is there a way to filter an IP or subnet from a IDS/IPS signature?
Senario:
We have 2 ASAs with IPS modules and 2 4260 IDS's, we use IPS Manager Express 6.1 to manage them. I keep getting a mail server that is triggering signature 5748-x because its sending a helo verb instead of a noop. This is fine for this paticular mail server. So i would like to remove its IP or filter its IP from the signature so when this happens the signature doesnt fire. However I dont want to disable the signature in case it happens somewhere else.
any help is greatly appreciated.
e-

It's not really too bad. I would encourage you to read still though;-)
Each signature can be configured with any number of actions. by default, a lot of them have the "product alert" action.
event action filters are basically a way to suppress all or some actions based on various criteria, like sigid and source (attacker) ip address. I've attached an example.

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In the IPS Manager (CSM 3.0) Configuration > Updates > Update Network IDS/IPS Signatures
Clicking on Apply (For instance, Update File: IPS-sig-S242-minreq-5.0-6.pkg) it appears the following error:
Object update failed. Unknown update type.
What is the problem?

It should be .zip file...
you can download from the below link
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Hi Gangadaran,
We can apply the same package on all the mentioned platforms. It can be applied to all below platforms:
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Refer the readme for all details:
http://www.cisco.com/web/software/282549755/37074/IPS-sig-S507.readme.txt
All the best!!
Thanks,
Prapanch

Defect in current IPS signatures causing crashes

In the "Caveats" section of the just-released S392 IPS signature update, Cisco acknowledges a "defect present" in the memory managerÂ which they're working on, but which can (ie very likely in our experience with our AIP-SSM-10 module and S389) cause the update to fail and requiring a manual power recycle of the ASA, leaving you back where you started -- hopefully, with the module up and current signature active, or at worse, unable to start up the AIP-SSM module.
Having had this happen to us, we are going to hold off going ahead with the upgrade, as we would be guaranteed to go through an unnecessary and unproductive ordeal. Â Â I would like to know of other users' experience with recent signatures, at least as new as S389.

I've experienced the same thing happening on several IPS that I manage going back to a few months even. Certainly is a pain in the neck to have your IDS come up after the upgrade but the anal engine not be running and require a reboot of the device.

CSM 3.1.0 doesn't update IPS signature after E2 engine

Hi!:
I have updated my IDS/IPS with E2 engine but now with CSM when I try to update my IDS, with a new signature, I received the next message:
"There is no package to update sensor, sensor is up to date"
I have in CSM S344 signature and my sensor have S342
Is possible to update signatures with CSM 3.1.0 after E2 engine?
Thank you
Alex

Refer to the following url for more info on upgrading to latest IPS signatures:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6634/prod_white_paper0900aecd8066d280.html
also refer the link below for more info on signature upgrade:
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/ips_v5.html

2651XM IPS Signature Update?

Hello,
I have a 2651XM 256MB/32MB running 12.4(25) and I would like to update the IPS signature file. I see that the last update for 256MB.sdf was from Aug 2008. The latest IPS I found is IPS-sig-S518-req-E4.pkg from
http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Intrusion+Prevention+System+%28IPS%29+Signature+Updates&mdfid=277801011&treeName=Security&mdfLevel=Model&url=null&modelName=Cisco+2651XM+Multiservice+Router&isPlatform=N&treeMdfId=268438162&modifmdfid=278279418&imname=Cisco+IDS+Access+Router+Network+Module&hybrid=Y&imst=Y
I've tried the command
ip ips sdf location flash:\\IPS-sig-S518-req-E4.pkg
ip ips sdf location flash:IPS-sig-S518-req-E4.pkg
but when I apply IPS to an interface and run 'show ip ips all' no signatures load and I get a message 'invalid token'.
I also tried seeing if the latest SDM will help but nothing.
My question is, what is it that I am doing wrong or missing? Is my router too old to be able to get the latest signature files?
Any advice or guidance to the right direction is much appreciated.
Thanks

You have a version of IOS that includes the older version of the IOS IPS feature (referred to as v4). This release only supports signature updates using the SDF formatted files. These files are no longer updated.
The signature update file you found (ending in .pkg) is the signature update package supported by Cisco's IPS appliances and is not compatible with the IOS IPS feature set.
The current IOS IPS feature (referred to as v5) also makes use of .pkg files. You will need to upgrade the IOS of your 2651 to a release in the T train such as 12.4(24)T2 to obtain the latest IOS IPS feature release.
You can find out more about the IOS IPS feature set here:
http://www.cisco.com/go/iosips
For starting with IOS IPS v5:
http://www.cisco.com/en/US/products/ps6634/products_tech_note09186a008097db66.shtml
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Is it really possible to revert IPS signatures from CSM

Hi folks,
I've been trying to revert IPS signatures that I deployed through CSM Signature policies to the older release but it doesn't seem to be working. Contrary to it Cisco's CSM guide says:
If you later decide that you did not want to apply a signature update, you can revert to the
previous update level by selecting the Signatures policy on the device, clicking the View
Update Level button, and clicking Revert
I can't imagine it is possible as the signatures are normally compiled into xml files. How would the sensor do it ?
Eugene

During installation a copy of files that will be replaced or updated during the installation will be copied into a backup directory.
The CLI has a "downgrade" command that can uninstall the last update, and the backup copies will be used to replace the files being removed.
A few things to be aware of:
1) Old configuration will be copied back. So changes made since the update may be lost.
2) This works only for Engine Updates and Signature Updates. Major Updates, Minor Updates, and Service Packs replace the complete operating system so there is too much data to try and make backup copies for.
3) This works only for the last update installed. Once you've downgraded the latest one, you can't downgrade the previous one.
4) This can be done through CLI, and now also available in CSM.
Here are some things to check in your situation where it appears to not be working.
Login to the sensor and execute "show ver".
Does the history in the "show ver" output show a Signature Update package as the last update installed?
If not then either another downgrade was previously done, or a Major Update, Minor Update, or Service Pack was the last package installed and can't be downgraded.
If it can't be done through CSM you might try the CLI' "downgrade" command and see if it works through the CLI or if the CLI gives you an error and explanation.

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What is the correct procedure to update the IOS IPS signatures on an 2911 router?
I know how to download the signatures file (eg. IOS-S556-CLI.pkg) but what is the correct way to install the update?
Thank you in advance!

The IPS signature package comes with a list of pre-enabled signatures, hence Cisco does not recommend enabling a lot more other signatures, especially not every single signature as documented.
The reason why is because the package might include retired/old signatures only for references, and not every single signature is required to protect your environment because you might not have the traffic for some signatures, you might not have some end hosts that are written with specific signatures, therefore, it becomes irrelevant if you enable it.
Typically here is how customer would enable/disable signatures:
- Use the default signature that is enabled by Cisco (the default should fit majority of the customers).
- Monitor it for a couple of months
- Disable those that you don't need, and enable others if you think you require it for specific.

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Mike

With the help of On-box local event correlation technology you can correlate. On-box local event correlation technology not only enables detection, but actually blocks multi-event attacks and malware in real time, complementing security incident management software such as the Cisco Security Monitoring, Analysis, and Reporting System (Cisco Security MARS) that correlate events across multiple devices.
Integrates with the Cisco Security Manager to correlate security events with the configured firewall rules and intrusion prevention system (IPS) signatures that can affect the security event

Where do IPS signature save at?

Hi
i successfully load the IOS IPS package into the router, verify via CLI and CCP the IPS signature did compile on the router. (advanced mode, around 588 signature is active)
but it went gone (happened twice), i just want to ensure few things
1. i did shut down my router, and migrate to production site, would it cause by the power off / on then IPS signature missing?
2. i did remove the "ip ips iosips in/out" command that previous apply at my interface, would this cause the IPS disable and gone?
just counldn't figure out why now my router only have 3 signature only..
thanks

1. Please use the doc below for reference on how to configure IOS-IPS on the router. I will try to answer your questions using this document.
http://tools.cisco.com/squish/9Be6a
2. You will see in step 2.1 we create directory on flash to store all the signature files and configurations.
e.g:
mkdir
router#mkdir ips
Create directory filename [ips]
Created dir flash:ips
3. In step 4.2 , we configure IPS signature storage location by referencing the directory we created above.
e.g:
ip ips config location flash:
router(config)#ip ips config location flash:ips
This is where the signature files will be stored.
4. In step 5.1 we copy the signature files to the router.
e.g:
router#copy ftp://cisco:[email protected]/IOS-S310-CLI.pkg idconf
Loading IOS-S310-CLI.pkg !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 7608873/4096 bytes]
The idconf command compiles the signature after the file is copied.
5. If all the above steps are done correctly, you should see the following files in flash:
router#dir ips
Directory of flash:/ips/
7 -rw- 203419 Feb 14 2008 16:45:24 -08:00 router-sigdef-default.xml <----Contains factory default signature definitions.
8 -rw- 271 Feb 14 2008 16:43:36 -08:00 router-sigdef-delta.xml
9 -rw- 6159 Feb 14 2008 16:44:24 -08:00 router-sigdef-typedef.xml
10 -rw- 22873 Feb 14 2008 16:44:26 -08:00 router-sigdef-category.xml
11 -rw- 257 Feb 14 2008 16:43:36 -08:00 router-seap-delta.xml
12 -rw- 491 Feb 14 2008 16:43:36 -08:00 router-seap-typedef.xml
64016384 bytes total (12693504 bytes free)
6. Make sure you do a 'Router#write memory' before you reload the router. This way the configuration done gets stored and is preserved after reboot.
Also make sure your configuration register on the router is correctly set to 0x2102.
Sid Chandrachud
TAC security solutions

IOS IPS Signature-File

Hi Guys,
We have recently purchased a Cisco ISR 2921, and on its docs it is writen that this product has a License for IOS IPS Signatrue File, but on the product Flash Memory there is no IOS IPS Sig-File.   and while i try to download the sig-file from Cisco, it fails.
Can any one tell me where is an alternate way to download the sig-file ?

900 active signatures is quite much for a system that has no dedicated IPS-ressources.
But you can controll which and how many signatures get enabled on your router:
In the following example I first disable all signatures and enable the ones for web-servers. So just decide which signatures you need. But don't forget to monitor your router-ressources.
gw#conf t
Enter configuration commands, one per line. End with CNTL/Z.
gw(config)#ip ips signature-category
gw(config-ips-category)#?
IPS signature category configuration commands:
category Category keyword
exit      Exit from Category Mode
no        Negate or set default values of a command
gw(config-ips-category)#category ?
adware/spyware                Adware/Spyware (more sub-categories)
all                           All Categories
attack                        Attack (more sub-categories)
configurations                Configurations (more sub-categories)
ddos                          DDoS (more sub-categories)
dos                           DoS (more sub-categories)
email                         Email (more sub-categories)
instant_messaging             Instant Messaging (more sub-categories)
ios_ips                       IOS IPS (more sub-categories)
l2/l3/l4_protocol             L2/L3/L4 Protocol (more sub-categories)
network_services              Network Services (more sub-categories)
os                            OS (more sub-categories)
other_services                Other Services (more sub-categories)
p2p                           P2P (more sub-categories)
reconnaissance                Reconnaissance (more sub-categories)
releases                      Releases (more sub-categories)
specially_licensed_signature Specially Licensed Signature (more sub-categories)
telepresence                  TelePresence (more sub-categories)
uc_protection                 UC Protection (more sub-categories)
viruses/worms/trojans         Viruses/Worms/Trojans (more sub-categories)
web_server                    Web Server (more sub-categories)
gw(config-ips-category)#category all
gw(config-ips-category-action)#retire true
gw(config-ips-category-action)#exit
gw(config-ips-category)#category web_server
gw(config-ips-category-action)#?
Category Options for configuration:
alert-severity   Alarm Severity Rating
enabled          Enable Category Signatures
event-action     Action
exit             Exit from Category Actions Mode
fidelity-rating Signature Fidelity Rating
no               Negate or set default values of a command
retired          Retire Category Signatures
gw(config-ips-category-action)#retired false
gw(config-ips-category-action)#exit
gw(config-ips-category)#exit
Do you want to accept these changes? [confirm]
gw(config)#
gw(config)#exit
gw#sh ip ips configuration | s IPS Signature Status
IPS Signature Status
    Total Active Signatures: 131
    Total Inactive Signatures: 4370
gw#
I didn't follow the thread and answered your first post to have less line-breaks in this post.

IOS IPS Signature Updates

Hi,
Is it possible to update signatures for IOS IPS or do we need to update the IOS to get more signatures?
Thanks and rgds
Rajesh

hi,
if you have cisco sdm, then it would be easy to update your IOS IPS signatures. You may need to upgrade IOS of the router only when the ips signature requires you to do it.

Tune IPS Signature

Hi,
I want to to tune IPS signature so that it can make exception of ip addresses.
the signature is 13004 (this is UDP scan signature) i have ciscoworks in my network which scan the network using UDP i dont want to disable the signature i just want to add the ip address of ciscoworks to safe list ( if it exists) i have configured the alert to be sent to my email and i got alot of those emails which says
high 13004-0 "AD - External UDP Scanner" x.y.z.w/src_port(*) 0.0.0.0/dest_port(*)
thanks

Alakabeer -
You want to configure an Event Action Rule for this signature with the IP address of your Ciscoworks host in the Event Action Variable:
http://www.cisco.com/en/US/docs/security/ips/7.0/configuration/guide/cli/cli_event_action_rules.html#wp1032319
- Bob

Anyone else notice IPS Signature 1548/0 firing frequently?

Hello.
We have seen IPS Signature 1548/0-"Microsoft Offic Picture Managed Memory Corruption" trigger frequently on image files downloaded from IP addresses associated with Microsoft, in the range of 207.46.0.0/16. This has happened for several different customers we manage and I'm wondering if anyone else has seen this new signature fire frequently.
It looks to me that this signature has not been tuned correctly by Cisco because in every case the "Source" IP in the alert was from Microsoft. Just wondering if anyone else has seen this too.
Jon.

The signature will be disabled and retired in an upcoming signature update. The new signature will have an updated benign triggers section to reflect that this sig may trigger on potentially benign traffic. In the meanwhile , please feel free to disable and retire this signature. Let me know if you have any additional questions.

Anyone else notice IPS Signature 1802/0 firing frequently?

We have seen IPS Signature 1802/0-"Ruby on Rails Remote Code Execution Vulnerability" trigger frequently on any webpage with XML with YAML content I'm wondering if anyone else has seen this new signature fire frequently.
It looks to me that this signature has not been tuned correctly by Cisco. We don't use Ruby on Rails anywhere in our environment, so we went ahead and disabled the signature, I'm just wondering if anyone else has seen this too.

Logged a TAC case and they are working on an update. You are correct this is a signature issue. No time table given. Since the new signature will replace the old one, they recomended we disable the current signature if the alerts were too much.

Filtering IPs on a IDS/IPS signature

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