Re: Heartbleed Rule

["Joel Esler (jesler)" <jesler () cisco com>]

Not all of them are.  We have rules for both directions.



On Apr 10, 2014, at 6:39 PM, Jefferson, Shawn <Shawn.Jefferson () bcferries com<mailto:Shawn.Jefferson () bcferries 
com>> wrote:

Any reason these rules are $EXTERNAL_NET -> $HOME_NET ?  Lot’s of false positives otherwise, performance, or something 
else?

I was hoping to use them to detect potential internal network heartbleed attacks, but would have to re-write them to do 
that (never ideal).

Thanks
Shawn

From: Joel Esler (jesler) [mailto:jesler () cisco com]
Sent: April 09, 2014 3:55 AM
To: Nicholas Bogart
Cc: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: Re: [Snort-users] Heartbleed Rule

Nick,

Might want to review the latest post on http://vrt-blog.snort.org<http://vrt-blog.snort.org/>.

--
Joel Esler
Sent from my iPhone

On Apr 9, 2014, at 4:46, "Nicholas Bogart" <nickybzoss () gmail com<mailto:nickybzoss () gmail com>> wrote:
Boss asked me about creating a rule for the OpenSSL Heartbleed.  I asked him why not just go update all the servers.  
He just stared at me.  So I am submitting to the community for review and comment the rule I drew up on this 
proof-of-concept exploit for the heartbleed vulnerability.
Exploit - https://gist.github.com/takeshixx/10107280
CVE - https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0160
Heartbleed References -
http://threatpost.com/seriousness-of-openssl-heartbleed-bug-sets-in/105309
https://threatpost.com/openssl-fixes-tls-vulnerability/105300
alert tcp any any -> $HOME_NET 443 (msg:"Attempted Heartbleed access exploitation for OpenSSL 1.0.1f and lower"; flow: 
to_server; content:"| 18 03 02 00 03 01 40 00 |"; reference:cve, CVE-2014-0160;)

NickyB
------------------------------------------------------------------------------
Put Bad Developers to Shame
Dominate Development with Jenkins Continuous Integration
Continuously Automate Build, Test & Deployment
Start a new project now. Try Jenkins in the cloud.
http://p.sf.net/sfu/13600_Cloudbees
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net<mailto:Snort-users () lists sourceforge net>
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users

Please visit http://blog.snort.org<http://blog.snort.org/> to stay current on all the latest Snort news!

------------------------------------------------------------------------------
Put Bad Developers to Shame
Dominate Development with Jenkins Continuous Integration
Continuously Automate Build, Test & Deployment 
Start a new project now. Try Jenkins in the cloud.
http://p.sf.net/sfu/13600_Cloudbees

_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users

Please visit http://blog.snort.org to stay current on all the latest Snort news!