nanog mailing list archives
Re: IOS Rookit: the sky isn't falling (yet)
From: Valdis.Kletnieks () vt edu
Date: Tue, 27 May 2008 13:35:41 -0400
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...
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Current thread:
- IOS Rookit: the sky isn't falling (yet) Nicolas FISCHBACH (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Alexander Harrowell (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Christopher Morrow (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Jared Mauch (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Gadi Evron (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Valdis . Kletnieks (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Adrian Chadd (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Chris Grundemann (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Adrian Chadd (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Valdis . Kletnieks (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) goemon (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Valdis . Kletnieks (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Sargun Dhillon (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Sean Donelan (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) goemon (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Sean Donelan (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Kevin Oberman (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Alexander Harrowell (May 27)
- RE: IOS Rookit: the sky isn't falling (yet) michael.dillon (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Valdis . Kletnieks (May 27)
- Re: IOS Rookit: the sky isn't falling (yet) Dorn Hetzel (May 27)