This python utility scans for vulnerability to the DROWN attack against TLS. It is distributed under the GPLv2 license, and includes a specific version of https://github.com/tintinweb/scapy-ssl_tls (which is also distributed under GPLv2) and https://github.com/hiviah/pyx509. We are grateful to both authors for providing these useful libraries.
This utility was written in an ad-hoc manner in order to identify only the most common vulnerable configurations. We emphasize that it cannot accurately detect all vulnerable servers, and no one should rely on it to confidently determine a particular server is not vulnerable.
In particular, the utility only detects SSLv2 support by a single port. DROWN is made worse by its cross-protocol nature, i.e. an HTTPS server that doesn't support SSLv2 may be vulnerable because it shares its public key with an SMTP server that does. This utility cannot detect this scenario, and we strongly recommend testing servers using our online scanner, at https://drownattack.com.
Likewise, it may also have false positives, i.e. it may indicate a server is vulnerable when it is in fact not.
Hubert Kario has also made different scanning scripts available here: https://mta.openssl.org/pipermail/openssl-dev/2016-March/005602.html
You need the Python enum, scapy, and pycrypto packages.
On a Debian system:
sudo apt-get install python-enum scapy python-crypto
and also run
pip install scapy-ssl_tls
Or with pip: sudo pip install enum pycrypto scapy pyasn1 scapy-ssl_tls
Mac users also report dnet as a dependency.
python scanner.py localhost 443
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python scanner.py localhost 587 -esmtp
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python scanner.py localhost 143 -imap
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python scanner.py localhost 25 -esmtp
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python scanner.py localhost 110 -pop3
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python scanner.py localhost 443 -bare