Fixing SSL Medium Strength Cipher Suites Supported

Fixing SSL Medium Strength Cipher Suites Supported

Posted by Peter Bassill on 01/01/2015


Nessus Summary



Nessus Plugin ID: 42873CVSS v3.0 Base Score: 5.3



Nessus Description:The remote host supports the use of SSL ciphers that offer medium strength encryption. Nessus regards medium strength as any encryption that uses key lengths at least 64 bits and less than 112 bits, or else that uses the 3DES encryption suite. Note that it is considerably easier to circumvent medium strength encryption if the attacker is on the same physical network.



How to Fix



This vulnerability is cased by a medium strength cipher being present in the SSL cipher suite. Medium strength is defined within Nessus as any cipher that is between 64-bit and 112-bit or is 3DES.



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Apache Fix



The follow configuration should be added to the security.conf file to apply globally or to virtual host:



SSLCipherSuite EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH



SSLProtocol All -SSLv2 -SSLv3 -TLSv1 -TLSv1.1



SSLHonorCipherOrder On



SSLCompression off



IIS Fix



The Microsoft Knowledge Base article "How to Restrict the Use of Certain Cryptographic Algorithms and Protocols in Schannel.dll" describes how to enable just the FIPS 140 algorithms. Here's a summary:



Disable weak ciphers



Open the registry editor and locate HKLMSYSTEMCurrentControlSetControlSecurityProviders



Set "Enabled" dword to "0x0" for the following registry keys:



SCHANNELCiphersRC4 128/128



SCHANNELCiphersRC2 128/128



SCHANNELCiphersRC4 64/128



SCHANNELCiphersRC4 56/128



SCHANNELCiphersRC2 56/128



SCHANNELCiphersRC4 40/128



SCHANNELCiphersRC2 40/128



SCHANNELCiphersNULL



SCHANNELHashesMD5



Enable strong ciphers



Open the registry editor and locate HKLMSYSTEMCurrentControlSetControlSecurityProviders



Set "Enabled" dword to "0xffffffff" for the following registry keys



SCHANNELCiphersTriple DES 168/168



SCHANNELHashesSHA



SCHANNELKeyExchangeAlgorithmsPKCS



If the Enabled word doesn't exist yet, please create the word and set the value to "0x0" or "0xffffffff" as required.







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