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TUCoPS :: Unix :: General :: a6117.htm

Samba remote buffer overflow



7th Apr 2003 [SBWID-6117]
COMMAND

	Samba remote buffer overflow

SYSTEMS AFFECTED

	 version 2.2 prior to 2.2.8a
	 version 2.0 prior or equal to 2.0.10
	 version Samba-TNG prior to 0.3.2

PROBLEM

	A remote root buffer overflow has been found  by  Digital  Defence  Inc,
	while sniffing strange traffic. As described  in  Digital  Defense  Inc.
	Security Advisory DDI-1013 [http://www.digitaldefense.net/]:
	
	An anonymous user can gain remote root access due to a  buffer  overflow
	caused by a StrnCpy() into a char array  (fname)  using  a  non-constant
	length (namelen).
	
	
	StrnCpy(fname,pname,namelen);    /* Line 252 of smbd/trans2.c */
	
	
	In the call_trans2open function in trans2.c, the Samba StrnCpy  function
	copies pname into fname using namelen. The variable namelen is  assigned
	the value of strlen(pname)+1, which causes the overflow.
	
	The variable 'fname' is a _typedef_ pstring, which  is  a  char  with  a
	size of 1024. If pname is greater than 1024, you  can  overwrite  almost
	anything  you  want  past  the  1024th  byte   that   fits   inside   of
	sizeof(pname), or  the  value  returned  by  SVAL(inbuf,smbd_tpscnt)  in
	function reply_trans2(), which should be around 2000 bytes.
	
	Forced Release
	 ==============
	
	This vulnerability is being actively  exploited  in  the  wild.  Digital
	Defense, Inc. discovered this bug by analyzing a packet  capture  of  an
	attack against a host running  Samba  2.2.8.  The  attack  captured  was
	performed on April 1st, 2003. Samba  users  are  urged  to  check  their
	Samba servers for signs of compromise. Samba and Digital  Defense,  Inc.
	decided to release their advisories before all vendors had a  chance  to
	update  their  packages  due  to  this  vulnerability   being   actively
	exploited.
	
	
	 Exploit
	 =======
	
	Due  to  explicit  non-copy  notice,  Digital  Defense  exploit  is  not
	attached here. (see below for an other one)
	
	From advisory:
	
	An exploit named trans2root.pl has been posted on the  Digital  Defense,
	Inc. website. A quick udp based based scanner named nmbping.pl has  also
	been posted to assist you in identifying Samba servers on your  network.
	Both are available for download from the following URL:
	
	
	   http://www.digitaldefense.net/labs/securitytools.html
	
	
	This exploit works against  all  distributions  listed  in  the  testing
	environment section. Usage is as follows:
	
	
	   trans2root.pl <options> -t <target type> -H <your ip> -h <target ip>
	
	
	This exploit should work against all x86  Linux,  Solaris,  and  FreeBSD
	hosts running the 2.2.x branch of Samba.  Hosts  with  a  non-executable
	stack are not vulnerable to this particular exploit.  The  exploit  will
	cause the target host to connect back to the host  running  the  exploit
	and spawn a root shell on the defined port (default is 1981).
	
	The scanner is very easy to use, and should detect  and  identify  Samba
	and Windows SMB services. Usage is as follows:
	
	
	   nmbping.pl <network/cidr>
	
	
	
	 Update 10 apr.
	 ==============
	
	noir sin [noir(at)olympos(dot)org] posted following exploit:
	
	0day is fragile! one day it's your precious, next day its worthless ...
	
	anyways i put together this SAMBAExploit class in python which might  be
	interesting for folks since it's reusable in many other stuff ...
	
	python cause; write once a heap, stack or fmt string exploit  class  and
	the rest is just to "cp old_exp.py new_exp.py; vi new_exp.py"
	
	exploit bruteforces all  possible  stack  range  and  dups  the  already
	connected socket for spawning the shell
	
	greets to: Michael Teo for pysmb, lsd-pl for linux/findsck shellcode
	
	- noir
	
	
	noir@juneof44:/tmp/samba_exp2 > python samba_exp.py 172.17.1.132
	[*]  brute forcing well known addr range ... [*]
	trying; retaddr: 0xbffed404
	trying; retaddr: 0xbffed504
	trying; retaddr: 0xbffed604
	trying; retaddr: 0xbffed704
	Linux localhost 2.4.9-e.3 #1 Fri May 3 17:02:43 EDT 2002 i686 unknown
	cat /etc/redhat-rel*
	Red Hat Linux Advanced Server release 2.1AS (Pensacola)
	id
	uid=0(root) gid=0(root) groups=99(nobody)
	exit
	*** Connection closed by remote host ***
	
	
	 Exploit code
	 =============
	
	
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	$`$`!````
	`
	end
	
	
	
	

SOLUTION

	Upgrading  to  the  latest  version  of  Samba  or  Samba-TNG   is   the
	recommended solution to this vulnerability. Samba  version  2.2.8a,  and
	Samba-TNG version 0.3.2  are  not  vulnerable.  There  will  be  no  new
	releases for the 2.0 line of Samba code. The only fix for Samba  2.0  is
	to apply the patches that Samba is providing.
	   
	A workaround in the current source code for this specific  vulnerability
	would be to modify the StrnCpy line found at line 250  in  smbd/trans2.c
	in the Samba 2.2.8 source code:
	
	
	   -StrnCpy(fname,pname,namelen);
	   +StrnCpy(fname,pname,MIN(namelen, sizeof(fname)-1));
	
	
	As a result of  this  vulnerability  being  identified  at  least  three
	others have also been found by the Samba team  after  reviewing  similar
	usages in the source tree. One is a static overflow and  the  other  two
	are heap overflows. Applying the fix above  will  only  protect  against
	the specific problem identified  in  this  advisory.  To  fully  protect
	yourself, you must apply the patches from Samba, or upgrade to 2.2.8a.
	
	Samba is available for download  from:  http://www.samba.org/  Samba-TNG
	is available for download from: http://www.samba-tng.org/


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