@lost89577 said in Snort: MD5 Hash - Rules Updates - Insecure?:
i know this is a long dead topic, but to validate the concern raised. A man in the middle attack was used against my firewall to supply blank sort rules which validated as latest version in snort. The attacker stopped some time after i side loaded the real rule set. i believe it was my ISP proxy that was compromised and no i don't believe i was the real target but all of the ISP users.
If you have to get to the web through your ISP's proxy, then your security is hosed from the get-go. The Snort rules URL is an SSL-secured site, so without the proxy you can be reasonably certain you are getting to the correct site based on the SSL session setup the CURL code stem uses within the Snort GUI. With the proxy, and you trusting the proxy's certificate, then you are wide open to your ISP and then to anything or anyone that compromises your ISP.
If your ISP won't let you bypass their proxy, then I would be trying to find me another ISP!