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TUCoPS :: Unix :: General :: unix5262.htm

INN - InterNet News format string overflow



15th Apr 2002 [SBWID-5262]
COMMAND

	InterNet News format string overflow

SYSTEMS AFFECTED

	inn <=2.2.3

PROBLEM

	Paul Starzetz [http://www.starzetz.com] says :
	

	There are several format string coding bugs as well as  unsecure  open()
	calls. In particular the inews and  the  rnews  binaries  are  affected.
	This may lead  to  serious  security  problems  if  those  binaries  are
	installed set-uid and are executable by any user. In the case of  inews,
	obtaining  uid  news  is  possible  (which  can  be  further   used   to
	replace/trojan other system files like the binaries themselves), in  the
	case of rnews, access to  probably  sensitive  inn  configuration  files
	seems possible (like inn password hashes etc).
	

	The attached archive contains a short proof of concept code for  one  of
	the format string bugs (look in the inews.sh script  for  more  details)
	in the inews binary. The code has been succesfully tested  against  SuSE
	7.0 where inews and rnews are setuid news. Later distributions seems  to
	use another security conecept - the  binaries  are  either  only  setgid
	news or  are  not  runnable  by  ordinary  users.  The  exploitation  is
	technically difficult - it requires a fake NNTP server  setup  somewhere
	(the code comes with the tar  package).  Note:  this  is  NOT  a  remote
	exploit. Look at the code for more  technical  details.  The  code  will
	create a setuid news shell.
	

	 Exploit :

	 =======

	

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SOLUTION

	Not yet.


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