The erlang port mapper daemon is used to coordinate distributed erlang instances. Should an attacker get the authentication cookie, remote code execution is trivial. Usually, this cookie is named ".erlang.cookie" and varies on location.
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pytacle is a tool inspired by tentacle. It automates the task of sniffing GSM frames of the air, extracting the key exchange, feeding kraken with the key material and finally decode/decrypt the voice data. All You need is a USRP (or similar) to capture the GSM band and a kraken instance with the berlin tables (only about 2TB).
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