SIPcrack

The sipcrack package provides tools for extracting SIP digest authentication information from network captures and bruteforcing passwords for sniffed accounts. It supports pcap files and wordlists to facilitate cracking of SIP credentials. This is useful for security testing of VoIP systems using the SIP protocol.

Sipdump captures SIP digest authentications to a file, either from live network interfaces, pcap files, or manual input. Sipcrack then uses this dump file to perform password bruteforcing, either from stdin or a specified wordlist.

These tools are part of Kali Linux's cybersecurity toolkit, targeting protocol-level authentication weaknesses in SIP-based communications.

Sipcrack operates by first using sipdump to sniff SIP traffic for digest authentication details, writing login data to a dump file. This includes usernames, realms, nonces, and responses from the SIP protocol's authentication challenge-response mechanism. Sipcrack then bruteforces the password by generating HA1 hashes (MD5(username:realm:password)) and comparing them against the captured response hashes, using either stdin input or a wordlist of passwords. It leverages libpcap for packet capture and libssl for cryptographic operations.