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flowbits: netsenum
From: waldo kitty <wkitty42 () windstream net>
Date: Wed, 29 May 2013 10:57:54 -0400


there is no check rule in the *.rules files for flowbits: netsenum...

additionally, both existing rules' MSG are identical... one should speak of "to 
client" and the other "to server" in the MSG for clarity??


registered subscriber using latest rules pulled 26 May 2013 for

    ,,_     -*> Snort! <*-
   o"  )~   Version 2.9.4.1 GRE (Build 69)
    ''''    By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team
            Copyright (C) 1998-2013 Sourcefire, Inc., et al.
            Using libpcap version 1.1.1
            Using PCRE version: 7.8 2008-09-05
            Using ZLIB version: 1.2.6



May 26 04:25:44 frodo snort[22314]: WARNING: flowbits key 'netsenum' is set but 
not ever checked.


$ grep -E "netsenum" /path/to/snort/*rules*/*.rules

/path/to/snort/rules/os-windows.rules:#alert tcp any [137,139] -> $HOME_NET any 
(msg:"OS-WINDOWS SMB Microsoft Windows RAP API NetServerEnum2 long server name 
buffer overflow attempt"; flow:to_client,established; flowbits:isset,netsenum; 
content:"|EA 00|"; depth:2; offset:60; isdataat:22; content:!"|00|"; within:16; 
distance:6; metadata:policy security-ips drop, service netbios-ssn; 
reference:bugtraq,54940; reference:cve,2012-1853; 
reference:url,osvdb.org/show/osvdb/84601; 
reference:url,technet.microsoft.com/en-us/security/bulletin/MS12-054; 
classtype:attempted-dos; sid:24007; rev:4;)

/path/to/snort/rules/os-windows.rules:alert tcp $HOME_NET any -> any [137,139] 
(msg:"OS-WINDOWS SMB Microsoft Windows RAP API NetServerEnum2 long server name 
buffer overflow attempt"; flow:to_server,established; content:"|68 00|WrLehD"; 
pcre:"/^[oz]/Ri"; content:"|01 00|"; within:2; distance:9; 
flowbits:set,netsenum; flowbits:noalert; metadata:service netbios-ssn; 
reference:bugtraq,54940; reference:cve,2012-1853; 
reference:url,osvdb.org/show/osvdb/84601; 
reference:url,technet.microsoft.com/en-us/security/bulletin/MS12-054; 
classtype:attempted-dos; sid:23839; rev:8;)

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