Re: Heartbleed Rule

["Jefferson, Shawn" <Shawn.Jefferson () bcferries com>]

Thanks everyone!  Makes sense....


From: JJC [mailto:cummingsj () gmail com]
Sent: April 10, 2014 5:09 PM
To: Jefferson, Shawn
Cc: Joel Esler (jesler); snort-users () lists sourceforge net
Subject: Re: [Snort-users] Heartbleed Rule

Beyond what Joel just responded with, if you are looking for internal-internal attacks often you will want your 
$EXTERNAL_NET variable defined as 'any'.  This would then make the rule direction that you noted effective even for 
inside -> inside traffic inspection.
JJC

On Thu, Apr 10, 2014 at 4:39 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<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.

--
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
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