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.