IIS: Disabling Weak SSL Protocols and Ciphers

October 08, 2009

It's no secret by now that if your web site sees credit card numbers (even if they are passed to a third party gateway) you need to comply with the PCI DSS standards.

Requirement 4.1 states:

Use strong cryptography and security protocols such as SSL/TLS or IPSEC to safeguard sensitive cardholder data during transmission over open, public networks.

If you are running IIS there are typically several weak Protocols and Ciphers enabled, such as SSLv2, and 40-56 bit key ciphers. The Internet Information Services Management Console doesn't have a GUI to let you disable these protocols and ciphers. You need to use Regedit to make several registry changes in order to disable these.

While doing some consulting work last week a client mentioned how useful it would be to have a product for toggling ciphers and protocols in IIS. I agreed, and built the following:

Screen shot of tool to disable weak ciphers and protocols in IIS

I also built a web based tool to test your server for SSLv2. The testing tool works on both IIS and Apache Web servers.

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