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