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TUCoPS :: Unix :: General :: unix5243.htm

talkd - each user can locally or remotely fake its user.



4th Apr 2002 [SBWID-5243]
COMMAND

	each user can locally or remotely fake its user.

SYSTEMS AFFECTED

	Probably all versions

PROBLEM

	Teknophreak of Malloc() [http://www.superw00t.com] found following :
	

	\"talk\" is a program available  on  multiple  *nix  OSes  which  allows
	users to communicate within a system and/or remotely.
	

	

	Their exist a flaw within the \"talkd\" which allows  anyone  masquerade
	as anyone else either remotely or within the  confines  of  the  system.
	This is due to  the  lack  of  user  validation  by  the  \"talkd\"  for
	incoming  \"talk\"  requests.  This  may  be  a  catalyist  for   social
	engineering which can lead to the  revealing  of  private  or  sensitive
	information from other users.
	

	

	 Identification of User Masquerading

	 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	

	If someone is initiating a talk  request  with  \"talksp00f\"  from  the
	user \"root\" for example. You should check to see if the root  user  is
	actually logged in. And  if  he  is  not  you  can  monitor  the  system
	processes and figure out who is initiating the bogus talk request.
	

	Also, if the user that is supposedly initiating the talk request to  you
	*is* logged in. Check that users processes to  see  if  he  is  actually
	initiating the talk request to you.
	

	

	 Exploitation

	 ~~~~~~~~~~~~

	

	\"Talksp00f\" written by: Teknophreak of Malloc()
	 Download: 

	http://www.superw00t.com/projects/talkspoof.tar.gz
	

	

	

	begin 600 talkspoof.tar.gz

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	`

	end

	

	

	 Update (06 April 2002)

	 ======

	

	Michael Brian Scher added :
	

	A copy of the informative 1996 posting by Rombout de  Backer  (r@idb.nl)
	is at:
	

	http://www.tao.ca/writing/archives/security/0214.html

	

	A cleaner copy, from a repost to the OpenBSD lists, is at:
	

	http://www.monkey.org/openbsd/archive/tech/9604/msg00010.html

	

	

	de Backer also posted a one-liner proof-of-concept change  to  the  talk
	from NetKit-B-0.05, and  there  were  modified  ytalk  clients  floating
	around with command-line options for  spoofing  by  the  end  of  April,
	1996. Any suggested fixes to talk will  only  work  locally,  where  the
	daemon can do some checking; any remote fixes really depend on  changing
	the protocol or migrating to a  safer  (or  explicitly  untrusted)  chat
	system. AUTH lookups (as suggested in the de Backer post) don\'t  really
	cut it:  n/talk are UDP protocols.

SOLUTION

	Nothing yet.


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