oss-security - Re: CVE request: Fwd: [Full-disclosure] SEC Consult SA-20121017-0 :: ModSecurity multipart/invalid part ruleset bypass

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Date: Thu, 18 Oct 2012 04:58:40 -0400 (EDT)
From: Jan Lieskovsky <jlieskov@...hat.com>
To: oss-security@...ts.openwall.com, Breno Silva <breno.silva@...il.com>
Cc: Matthias Weckbecker <mweckbecker@...e.de>, security@...security.org,
        Kurt Seifried <kseifried@...hat.com>
Subject: Re: CVE request: Fwd: [Full-disclosure] SEC Consult
 SA-20121017-0 :: ModSecurity multipart/invalid part ruleset bypass

Hi Kurt, Breno,

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On 10/17/2012 02:47 AM, Matthias Weckbecker wrote:
> Hi Steve, Kurt, vendors,
> 
> this flaw looks slightly different from the last one and
> apparently has not got a CVE yet.
> 
> ----------  Forwarded Message  ----------
> 
> Subject: [Full-disclosure] SEC Consult SA-20121017-0 ::
> ModSecurity multipart/invalid part ruleset bypass Date: Wednesday
> 17 October 2012 From: SEC Consult Vulnerability Lab 
> <research@...-consult.com> To: full-disclosure@...ts.grok.org.uk, 
> bugtraq@...urityfocus.com
> 
> SEC Consult Vulnerability Lab Security Advisory < 20121017-0 > 
> =======================================================================
>
>
> 
> title: ModSecurity multipart/invalid part ruleset bypass
> product: ModSecurity vulnerable version: <= 2.6.8 fixed version: 
> 2.7.0 CVE number: - impact: Depends what you use it for homepage: 
> http://www.modsecurity.org/ found: 2012-10-12 by: Bernhard Mueller
>  SEC Consult Vulnerability Lab https://www.sec-consult.com 
> =======================================================================
>
> Looking
>
> 
> through
> 
> https://www.modsecurity.org/tracker/secure/ReleaseNote.jspa?projectId=10000&version=10100
> 
> Is this https://www.modsecurity.org/tracker/browse/MODSEC-155

I am not sure this is related since it is closed with resolution 'Cannot Reproduce'.

Based on Changes:
  [1] http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.7.x/CHANGES

I would say this is:
  "* Added MULTIPART_INVALID_PART flag. Also used in rule id 200002 for multipart strict"

with relevant upstream commit being:
  [2] http://mod-security.svn.sourceforge.net/viewvc/mod-security?view=revision&sortby=date&revision=2081

but Cc-in Breno Silva to definitely confirm this yet.

Breno, could you please confirm / disprove that the patch [2] is upstream
patch for issue:
  [3] http://www.openwall.com/lists/oss-security/2012/10/17/1 ?

And if it's not the correct one, provide an explicit revision link to
the proper one?

Thank you && Regards, Jan.
--
Jan iankko Lieskovsky / Red Hat Security Response Team

> 
> I'd like to confirm this before assigning a CVE.
> 
> - -- 
> Kurt Seifried Red Hat Security Response Team (SRT)
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