SSL/TLS

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SSL/TLS
DROWN
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# Check for "SSLv2 supported"
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nmap –p- –sV –sC example.com
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TLS_FALLBACK_SCSV
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# Check in the lower port
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openssl s_client –tls1 -fallback_scsv -connect example.com:443
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# - Response:
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# tlsv1 alert inappropriate fallback:s3_pkt.c:1262:SSL alert number 86
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BEAST
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# TLSv1.0 and CBC ciphers
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openssl s_client -[sslv3/tls1] -cipher CBC_CIPHER -connect example.com:443
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LUCKY13
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openssl s_client -cipher CBC_CIPHER -connect example.com:443
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Sweet32
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openssl s_client -cipher 3DES -connect example.com:443
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Logjam
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# Check the "Server Temp Key" response is bigger than 1024 (only in OpenSSL 1.0.2 or better)
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openssl s_client -connect www.example.com:443 -cipher "EDH"
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SSLv2 Support
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# If is supported this will return the server certificate information if not, error
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openssl s_client –ssl2 -connect example.com:443
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SSLv3 Support
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# If is supported this will return the server certificate information if not, error
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openssl s_client -ssl3 -connect google.com:443
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Cipher suites
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# Cipher Suites
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nmap --script ssl-enum-ciphers -p 443 example.com
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​
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# - Anon cypher (fail)
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openssl s_client -cipher aNULL -connect example.com:443
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​
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# - DES Cipher (fail)
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openssl s_client -cipher DES -connect example.com:443
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​
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# - 3DES Cipher (fail)
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openssl s_client -cipher 3DES -connect example.com:443
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​
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# - Export Cipher (fail)
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openssl s_client -cipher EXPORT -connect example.com:443
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​
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# - Low Cipher (fail)
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openssl s_client -cipher LOW -connect example.com:443
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​
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# - RC4 Cipher (fail)
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openssl s_client -cipher RC4 -connect example.com:443
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​
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# - NULL Cipher (fail)
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openssl s_client -cipher NULL -connect example.com:443
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​
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# - Perfect Forward Secrecy Cipher (This should NOT fail):
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openssl s_client -cipher EECDH, EDH NULL -connect example.com:443
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Secure renegotiation
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# Check secure renegotiation is not supported
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# If not, send request in the renegotiation
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# Once sent, if it's vulnerable it shouldn't return error
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openssl s_client -connect example.com:443
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HEAD / HTTP/1.0
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R
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# <Enter or Return key>
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CRIME
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# Check for "Compression: NONE"
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openssl s_client -connect example.com:443
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BREACH
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# If the response contains encoded data, host is vulnerable
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openssl s_client -connect example.com:443
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GET / HTTP/1.1
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Host: example.com
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Accept-Encoding: compress, gzip
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Heartbleed
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# Heartbleed
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nmap -p 443 --script ssl-heartbleed --script-args vulns.showall example.com
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# Heartbleed checker oneliner from sites list
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cat list.txt | while read line ; do echo "QUIT" | openssl s_client -connect $line:443 2>&1 | grep 'server extension "heartbeat" (id=15)' || echo $line: safe; done
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Change cipher spec injection
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nmap -p 443 --script ssl-ccs-injection example.com
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Cipher order enforcement
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# Choose a protocol and 2 different ciphers, one stronger than other
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# Make 2 request with different cipher order anc check in the response if the cipher is the first of the request in both cases
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nmap -p 443 --script ssl-enum-ciphers example.com
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openssl s_client –tls1_2 –cipher ‘AES128-GCM-SHA256:AES128-SHA’ –connect contextis.co.uk:443
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openssl s_client –tls1_2 –cipher ‘AES128-SHA:AES128-GCM-SHA256’ –connect contextis.co.uk:443
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