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Fixing up Net-Creds

ID: 20fbf68d-04e8-57ce-832d-4b6a9348cd30

STIX ID: report--20fbf68d-04e8-57ce-832d-4b6a9348cd30

Feed Name: SensePost Blog

Date Published: 2018-02-20

Date Updated: 2026-04-29

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The report details how incorrect HTTP header parsing and a misordered function call in MITMf/net-creds caused NTLMSSP challenges in HTTP 407 Proxy-Authenticate responses to be missed, resulting in “CHALLENGE NOT FOUND” during ARP spoof/WPAD MITM credential harvesting. After analyzing traffic with Wireshark, the author rewrote the header-parsing logic to account for HTTP response first-line handling and corrected the argument order, restoring proper extraction of full NETNTLMv2 hashes on Windows 10 networks. The fixes were submitted and accepted in both MITMf and net-creds, enabling reliable proxy-auth–based credential capture.

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