23 September 2008 | 8,315 views

ohrwurm – RTP Fuzzing Tool (SIP Phones)

Cyber Raptors Hunting Your Data?

ohrwurm is a small and simple RTP fuzzer, it has been tested it on a small number of SIP phones, none of them withstood the fuzzing.


  • reads SIP messages to get information of the RTP port numbers
  • reading SIP can be omitted by providing the RTP port numbers, so that any RTP traffic can be fuzzed
  • RTCP traffic can be suppressed to avoid that codecs learn about the “noisy line”
  • special care is taken to break RTP handling itself
  • the RTP payload is fuzzed with a constant BER
  • the BER is configurable
  • requires arpspoof from dsniff to do the MITM attack
  • requires both phones to be in a switched LAN (GW operation only works partially)

You can download ohrwurm 0.1 here:


Or read more here.


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