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Re: IOS Rookit: the sky isn't falling (yet)
On Tue, 27 May 2008, [email protected] wrote:
On Tue, 27 May 2008 11:24:19 MDT, Chris Grundemann said:Like MD5 File Validation? - "MD5 values are now made available on Cisco.com for all Cisco IOS software images for comparison against local system image values."That does wonders for catching a corruption in the FTP that wasn't caught by the relatively weak TCP checksumming. But if the attacker has the wherewithal to cause a modified file to be downloaded (either by replacing it on the real server, or getting you to visit a fake server), they can also present you with a webpage that has an MD5 hash that matches the modified file. Now, if they provided a PGP signature of the file, done with a key that I have reason to trust, *that* raises the bar significantly...
What you want is cisco hardware that verifies firmware signatures in hardware.