Wireshark, our all-time favorite protocol analyzer, released a new version (1.0.4). The new version includes a number of security fixes. For details, see http://www.wireshark.org/news/20081020.html . 

Just by its nature of including a large number of protocol parsers, Wireshark is a somewhat risky program. To mitigate the risk, I personally prefer to collect traffic using a simpler program like tcpdump, and later analyze the traffic in wireshark using a low privilege account.

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Johannes B. Ullrich, Ph.D.
SANS Technology Institute