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Check the instance of ADDR_ENTRY[0] #4565

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Merged
merged 2 commits into from
Dec 28, 2024
Merged

Check the instance of ADDR_ENTRY[0] #4565

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48a3f2f
Check the instance of ADDR_ENTRY[0]
guedou Oct 14, 2024
d7b4c7a
Update test/scapy/layers/netbios.uts
guedou Oct 21, 2024
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3 changes: 2 additions & 1 deletion scapy/layers/netbios.py
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Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,8 @@ class NBNSQueryResponse(Packet):
]

def mysummary(self):
if not self.ADDR_ENTRY:
if not self.ADDR_ENTRY or \
not isinstance(self.ADDR_ENTRY[0], NBNS_ADD_ENTRY):
return "NBNSQueryResponse"
return "NBNSQueryResponse '\\\\%s' is at %s" % (
self.RR_NAME.decode(errors="backslashreplace"),
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8 changes: 8 additions & 0 deletions test/scapy/layers/netbios.uts
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Expand Up @@ -99,3 +99,11 @@ assert pkt[NBNSWackResponse].RR_NAME == b'SARAH'
z = raw(TCP()/NBTSession())
assert z == b'\x00\x8b\x00\x8b\x00\x00\x00\x00\x00\x00\x00\x00P\x02 \x00\x00\x00\x00\x00\x00\x00\x00\x00'
assert NBTSession in TCP(z)

= OSS-Fuzz Findings

# Note: the packet is corrupted
with no_debug_dissector():
raw_packet = b'E\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x05\x00\x00\x00'
packet = NBNSQueryResponse(raw_packet)
assert packet.summary() == "NBNSQueryResponse"
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