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Voice over IP is emerging as the key technology in the current and future Internet. This paper shares some essential practical experience gathered over a two years period in searching for vulnerabilities in the VoIP space. The authors will show a terrifying landscape of the most dangerous vulnerabilities capable to lead to a complete compromise of an internal network. All of the described vulnerabilities have been disclosed responsibly by their group and were discovered using their in-house developed fuzzing software KIF. The paper provides also mitigation techniques for all described vulnerabilities.
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