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

Similar Messages

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.

Correct procedure to update IOS IPS signatures on 2911 router

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.

How to upgrade IPS Signature

Can anyone help me with the steps of upgrading the IPS signature for the platform ASA SSM-20, IDS 4215, WV-SVC-IDSM-2 via IDM and IME. All the sensors are already upgraded with Engine E4 with signature S480.
Can I upgrade the signature directly from S480 to S507? Please let me know the file which I need to download. Is there any impact while updating the signture like reboot?

Hi Gangadaran,
We can apply the same package on all the mentioned platforms. It can be applied to all below platforms:
- IPS-42xx Cisco Intrusion Prevention System (IPS) sensors
- IDS-42xx Cisco Intrusion Detection System (IDS) sensors (except the IDS-4220, and IDS-4230)
- WS-SVC-IDSM2 series Intrusion Detection System Module (IDSM2)
- NM-CIDS IDS Network Module for Cisco 26xx, 3680, and 37xx Router Families.
- ASA-SSM-10 Cisco ASA Advanced Inspection and Prevention Security Services Module (Requires ASA)
- ASA-SSM-20 Cisco ASA Advanced Inspection and Prevention Security Services Module (Requires ASA)
- ASA-SSM-40 Cisco ASA Advanced Inspection and Prevention Security Services Module (Requires ASA)
- AIM-IPS Cisco Advanced Integration Module for ISR Routers
Refer the readme for all details:
http://www.cisco.com/web/software/282549755/37074/IPS-sig-S507.readme.txt
All the best!!
Thanks,
Prapanch

How to convert Cisco IPS signatures to a MARS events - no keyword search

I am trying to run a scheduled report looking for the new Microsoft exploit under the IPS S411 release, SIGID 19339.0 and I am trying to form the query looking for the event this falls under without using a keyword search on the SIGID. Does anyone know how to correlate an IPS signature to a MARS event?
Thanks,
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.

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.

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.

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.

IOS IPS Signatures for password guessing?

I recently experienced a password-guessing attack. The inside Windows server's security was pretty well useless in stopping the attack (block, yes; stop, no), because the user ID kept changing, and Windows account lockout ignores source addresses. In this case, it was FTP, and I found an IPS signature for that, but it got me to thinking:
There don't seem to be password-guessing signatures for RDP, HTTP, HTTPS, or SSL. Granted it may not be practical for HTTPS and SSL, but what about the other two? Should we consider rolling our own?

You can configure custom signatures for IOS IPS using Security Monitor which is part of VMS. Below is a doc on how to do this:
http://www.cisco.com/en/US/products/sw/cscowork/ps3990/products_user_guide_chapter09186a0080104f44.html#xtocid9
Also try this link for Cisco Security Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a008055dbdd.shtml

MARS: IPS Signature Dynamic Update Failed

Hello all,
I checked the signature update on the MARS system and it has no update for over 6 months. My bad. I should checked this regularly.
So I tested the connectivity and it said successful. Did the update now and failed:
Download Failed: CS-MARS could not download IPS Signature file - IPS-CS-MARS-Sig-S482.zip
at Apr 09, 2010 11:51:42 AM EDT
It seems it does see the new signature out there but the down load failed not sure why. I manually down load the signature and SSH to
the box manually did the pnupgrade using ftp and also got error:
CSMARS Upgrade...........[1126]
Loading..................[IPS-CS-MARS-Sig-S481.zip]
    User.................[myID]
    Protocol.............[ftp]
    Host.................[x.xx.xx.xx]
    Path.................[CiscoIOS/IPS-CS-MARS-Sig-S481.zip]
    Modified.............[Thu, 08 Apr 2010 13:19:11 GMT]
    Size.................[632711]
######################################################################## 100.0%
[Alert][get_pkg_info/223]: no IPS-CS-MARS-Sig-S481.zip package info.
[Alert][main/265]: fail to find IPS-CS-MARS-Sig-S481.zip version info.
Strip Meta Data..........[IPS-CS-MARS-Sig-S481.zip]
Decrypt Package..........[IPS-CS-MARS-Sig-S481.zip]
[Error][decrypt_pkg/181]: fail to decrypt IPS-CS-MARS-Sig-S481.zip(2).
So from there may be file was corrupted so I did the same for S480, S479, S478 and got same error.
Checked the thread in the community and follow the same step that in the threat and I am still geting no where.
Case is opened and still going no where.
If anyone ran into this problem before and had a solution for this is appreciated.
Thank you.

It does not support manually downloading the file and perform the update.
Please use either local web server or direct connection to cisco.com site from the MARS as follows to update the IPS signature:
http://www.cisco.com/en/US/docs/security/security_management/cs-mars/6.0/device/configuration/guide/chIpsCisoc6x.html#wp440709
Hope that helps.

IPS Signature Dynamic Update

Hello,
I need to know what type of privilege I need to use IPS Signature Dynamic Update.
Thank

Since the IPS dynamic update is accessed from the Admin tab, only the accounts having Admin privilege can change/modify the dynamic update settings, Here is a description of the various user roles in CS-MARS (taken directly from the user guide):
â¢Admin: has full use of the MARS.
â¢Notification Only: for a non-user of the MARS appliance, use this to send alerts to people who are not administrators, security analysts, or operators.
â¢Operator: has read-only privileges.
â¢Security Analyst: has full use of the MARS, except cannot access the Admin tab
Hope this helps

Tune IPS Signature

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