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
========================
Content-Type: application/octet-stream; name=\"snmpx.c\"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=\"snmpx.c\"
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