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TUCoPS :: Unix :: General :: unix4969.htm

snmpnetstat remote heap overflow



4th Jan 2002 [SBWID-4969]
COMMAND

	snmpnetstat remote heap overflow

SYSTEMS AFFECTED

	ucd-SNMP-4.2.3

PROBLEM

	In Axioma Security Research  advisory  [www.axiomasistemas.com],  thanks
	to Juan M. de la Torre :
	

	When snmpnetstat request the list of  interfaces,  it  first  allocs  an
	array to hold all the structs, one for each interface fetched. Then,  it
	sends a getnextrequest PDU to the server requesting ifindex, ifaddr  and
	ifnetmask, and saves this values in the first null entry of  the  array.
	Then it sends another getnextrequest PDU requesting  ifindex,  and  some
	other variables. If the ifindex value returned by  server  is  different
	from the one  previusly  fetched,  and  the  interface  currently  being
	scanned is the  last,  the  memory  located  after  the  array  will  be
	overwritten with the  variables  returned  by  server,  causing  a  heap
	overflow.
	

	 RedHat Linux 7.1 exploit

	 ========================

	 

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