Full Disclosure mailing list archives

Re: Ubuntu: reseed(8), random.org, and HTTP request


From: Jeffrey Walton <noloader () gmail com>
Date: Wed, 6 Jul 2011 03:44:23 -0400

On Wed, Jul 6, 2011 at 3:23 AM, coderman <coderman () gmail com> wrote:
On Tue, Jul 5, 2011 at 9:04 PM, Jeffrey Walton <noloader () gmail com> wrote:
Ubuntu's reseed(8) can be used to seed the PRNG state of a host. The
script is run when the package installed, and anytime su executes the
script.

... someone thought this was a good idea.
 [an entropy pool remotely biased by MitM attacker, maybe?]
:)

reseed(8) performs a unsecured HTTP request to random.org for its
bits, despite random.org offering HTTPS services.

https doesn't help if your host entropy pool is poorly seeded.
 [SSL/TLS needs entropy for authenticity/privacy.]


The Ubuntu Security Team took no interest when contacted by email (no
reply); the point of contact listed in the man pages took no interest
when contacted by email (no reply); and a launcher bug report was not
acted upon (https://bugs.launchpad.net/ubuntu/+source/reseed/+bug/804594).

you're surprised?
Hardly - listed for completeness.

 [you must be new around here!]

Jeff

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