Snort mailing list archives
Re: [Snort-users] 2.9.0.1 performance issue
From: Eoin Miller <eoin.miller () trojanedbinaries com>
Date: Thu, 18 Nov 2010 17:01:33 +0000
On 11/18/2010 4:26 PM, L0rd Ch0de1m0rt wrote:
Hello. To be clear, there is no fix for the "http_inspect\stream reassembly" bug at the moment (if there is a fix in SVN, let me know so I can take action here b/c this is seriously a non-trivial bug for me). Apparently it is an issue with Stream5 having premature buffer flushing issues. Government/Critical Infrastructure companies take note: this bug leads to easy IDS/IPS evasion and this issue, "predates Snort 2.9.0" according to Sourcefire. -L0rd C. On Thu, Nov 18, 2010 at 10:09 AM, matan monitz<mmonitz () gmail com> wrote:sounds related to the http_inspect\stream reassembly bugfix
The stream reassembly+http_inspect bug has been around for quite some time. The one that got fixed recently with http_inspect was the chunked+gzip bug that had also been around for quite some time. http_inspect would do either dechuning or gunzip'ing, but not both. So if a client downloaded gzip'd http that was chunked, http_inspect would dechunk it (but not gunzip it) before shoving it off to the rules engine for inspection. This got fixed in 2.9.0 though, so I wouldn't think that is the reason for the code change between 2.9.0 and 2.9.0.1. -- Eoin ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Snort-devel mailing list Snort-devel () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-devel
Current thread:
- 2.9.0.1 performance issue Frank Eberle (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue Matt Olney (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue matan monitz (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue L0rd Ch0de1m0rt (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue Eoin Miller (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue Russ Combs (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue matan monitz (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue matan monitz (Nov 18)
- Re: [Snort-users] 2.9.0.1 performance issue Matt Olney (Nov 18)