Tool and Usage
- BSD 2-clause
- Programming language
- Daniel Roethlisberger
- Latest release
- Latest release date
SSLsplit is a tool for man-in-the-middle attacks against SSL/TLS encrypted network connections. Connections are transparently intercepted through a network address translation engine and redirected to SSLsplit. SSLsplit terminates SSL/TLS and initiates a new SSL/TLS connection to the original destination address, while logging all data transmitted. SSLsplit is intended to be useful for network forensics and penetration testing.
SSLsplit supports plain TCP, plain SSL, HTTP and HTTPS connections over both IPv4 and IPv6. For SSL and HTTPS connections, SSLsplit generates and signs forged X509v3 certificates on-the-fly, based on the original server certificate subject DN and subjectAltName extension. SSLsplit fully supports Server Name Indication (SNI) and is able to work with RSA, DSA and ECDSA keys and DHE and ECDHE cipher suites. Depending on the version of OpenSSL, SSLsplit supports SSL 3.0, TLS 1.0, TLS 1.1 and TLS 1.2, and optionally SSL 2.0 as well. SSLsplit can also use existing certificates of which the private key is available, instead of generating forged ones. SSLsplit supports NULL-prefix CN certificates and can deny OCSP requests in a generic way. For HTTP and HTTPS connections, SSLsplit removes response headers for HPKP in order to prevent public key pinning, for HSTS to allow the user to accept untrusted certificates, and Alternate Protocols to prevent switching to QUIC/SPDY. As an experimental feature, SSLsplit supports STARTTLS mechanisms in a generic manner.
Usage and audience
SSLsplit is commonly used for learning, network analysis, penetration testing, or security assessment. Target users for this tool are pentesters and security professionals.
Tool review and remarks
The review and analysis of this project resulted in the following remarks for this security tool:
- + The source code of this software is available
Supported operating systems
SSLsplit is known to work on Linux.
Similar tools to SSLsplit:
The mitmproxy tool allows to intercept, inspect, modify, and replay traffic flows. It may be used for pentesting, troubleshooting, or learning about SSL/TLS.
The sslcaudit project helps with automated testing of SSL/TLS clients for resistance against MITM attacks.
Google's Certificate Transparency project audits the way SSL/TLS certificates are used and its underlying cryptographic system.
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