Prebellico crashes while processing certain SNMP community strings.

[unixrox]

Prebellico from time to time will crash when processing specific SNMP community strings. The traceback produces an 'IndexError: list index out of range' on line 326 in 'udpdiscovery' on the following line:
communitystring = filter(lambda x: x in printtable, snmptempdata[0])

This occurs just after host identification via UDP and port 161. This issue was originally identified by @unixrox and then later reported by @n8tr0n .

A sample PCAP has been obtained which can reproduce this issue and is being worked on.

[unixrox]

This new code might potential resolve this issue. Will continue to monitor.

[unixrox]

Did some additional testing against some new code and it looks as if this issue is resolved. I do not have raw data to confirm this with the last reported crash by @n8tr0n so I am going to close this out for now.

[unixrox]

This appeared to crash again, so I am reopening the issue:

Traceback (most recent call last):
File "prebellico.py", line 941, in
sniff.loop(0, inspectproto)
File "prebellico.py", line 203, in inspectproto
udpdiscovery(header,data)
File "prebellico.py", line 355, in udpdiscovery
potentialSnmpStrings = re.split('[\x00-\x1f,\x7f-\xff]',snmpTempData[0])
IndexError: list index out of range

[unixrox]

@n8tr0n I believe that I have provided a decent solution in the last commit to the master branch: 92e771d

Please let me know if this resolves the issue for you.