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Re: Ip_proto's 'lsrre' parameter
From: Steven Sturges <steve.sturges () sourcefire com>
Date: Thu, 21 Oct 2010 09:11:03 -0400

Hi Joshua--

First, for clarification, this is in ipots, not in ip_proto.

As for the code, the ipopts rule option is a striaght-up
check against the number, and 'lsrre' has been in there
since revision 1.1 in 2000, so it will match when there
is an IP option with value of 0x84.

SID 501 is pretty old, so I'm not entirely sure how
the rule covers the vuln referenced .

VRT, perhaps you can shed some light on that part?

Cheers.
-steve

On 10/18/2010 5:16 PM, Joshua.Kinard () us-cert gov wrote:

Hi -devel,

I was looking at the ip_proto option in detail, and noticed that in the
source code, an undocumented parameter, 'lsrre', exists.  This is not
only not referenced in the 2.9.0 manual, but per a thread[1] from ~July
2007, it also refers to an unofficial IANA number[2], 0x84 (132 dec).
The 'lsrr' parameter has an official IANA value of 0x83 (131 dec).

Is there any clarification available on what 'ip_proto:lsrre;' would
target?  It's used in misc.rules 1:501:4, and references CVE-1999-0909
(which then refers to MS99-038)[3], so it looks to me to be a one-off
option for a specific Windows flaw (much like the entire 'cvs' rule
option).

Can this parameter also get a mention in the next update of the 2.9.0
manual?

Refs:
1. http://www.mcabee.org/lists/snort-users/Jul-07/msg00010.html
   http://www.mcabee.org/lists/snort-users/Jul-07/msg00011.html

2. http://www.iana.org/assignments/ip-parameters

3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-1999-0909
   http://www.microsoft.com/technet/security/bulletin/ms99-038.mspx


Thanks!,

--J

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