Re: CVE-2012-5076 and CVE-2012-1723 Rules

[Y M <snort () outlook com>]

My intention of adding the ET ruleset was never driven for a comparison sake. The website I was checking clearly had 
similar behavior/symptoms of exploit methods based on Java and/or Adobe and I was not aware that the AV already 
detected them at the time. My intention was if this is a new exploit that's not yet covered by VRT/ET, I would gather 
as much information and forward them to the community. However, once I saw the AV complaining about it, I thought to 
share it anyway for further improvements as it may benefit someone. If the specifics that I was testing with can add 
some help, like the blackhole website, pcaps or any other information I have, please let me know so I can forward them.
 Joel and Nathan, thank you both for the wonderful attitude and news about the community ruleset. YMSubject: Re: 
[Snort-sigs] CVE-2012-5076 and CVE-2012-1723 Rules
From: jesler () sourcefire com
Date: Mon, 26 Nov 2012 10:14:20 -0500
CC: snort () outlook com; snort-sigs () lists sourceforge net
To: lists () packetmail net

On Nov 26, 2012, at 10:00 AM, "lists () packetmail net" <lists () packetmail net> wrote:On 11/25/2012 07:34 PM, Joel 
Esler wrote:> I'll take a look and see what we cando to improve any coverage we are missing,blackhole, especially v2, 
is a pain.
Joel, on the ET side and based on my network analysis, I am seeing very goodmethods for combating some of this.  I 
would like for us to work more on this,any more news regarding a community focused ruleset without delay 
betweenregistered users and subscribers?
We cover blackholev2 in much the same way.  Eoin's rules started our coverage with bhekv2 and we've made modifications 
along the way, and added a ton ourselves.  They have worked very well.  I watch exploit kits pretty regularly to make 
sure we improve coverage for these.  I just wrote protection for 3 other exploit kits this weekend and they should be 
shipped soon after testing.
As far as the community ruleset, the tl;dr is yes.
Longer:We were going to get this done in Q2 of this year, but with the massive ClamAV transition that took place this 
was placed on the back burner.  Now that we have recovered much of our cycles and reorganized the organization a bit to 
deal with the changes, we are now moving forward on it again.  There was some legal license work to do with the legal 
team that I had to get knocked out first, which involves writing provisions into the VRT license for the community 
ruleset (and some other beneficial changes!) along with making it simpler to read.  I'm due to provide my followup 
comments to the legal team this week about it, and then our DIE team can get working on the actual coding of the 
ruleset.  The way we have decided to do it is beneficial for everyone.  Registered, Subscriber, OEM, etc.  It'll 
involve a bit of coding, but it shouldn't be an issue.
On 11/25/2012 04:26 AM, Snort Troubleshooting wrote:I went ahead and downloaded ET (open-source) rules and stuck them 
in there.
Then I browsed to the blackhole website again, and Snort fired on two ET
Rules, namely, sid:2015724, and sid:2015725.
You've just stumbled across some idiosyncratic differences between the VRT andET rulesets.  This has been discussed in 
the past but myself being a participantin the ET ruleset I can say that as compared to VRT, ET/we are more focused 
onthe exploit kit and permutations of the exploit kits as a community and havegreat coverage based on community input.
As I said above, we have some fantastic coverage for exploit kits (in exploit-kit.rules) and we adapt it to change the 
situations that pop up when needed.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire

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