full-disclosure - password hash, funny myth in the industry!

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Message-ID: <8e5ffb560710161230w283aa980m7448ab28e7850887@mail.gmail.com>
Date: Wed, 17 Oct 2007 01:15:56 +0545
From: "Bipin Gautam" <gautam.bipin@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: password hash, funny myth in the industry!

hi list,
i was reading the article, http://www.f-secure.com/weblog/archives/00001293.html
but just an example.

why do many people out there think password hash "can't be" as good as
the password itself and needs to be computed/cracked first before it
can be used?

Consider the fact, many websites/forums don't use password hash+salt,
just password hash( generally SHA1, MD5) that gets computer client
side and POSTED to the web-forum for user authentication.

If someone can sniff this, given that, user name is available using
simple GUI tools as 'Tamper Data' ( firefox plug in ) even a low tech
malicious user can log on with someones credentials without having to
crack the password hash, instead just using the password hash itself
manipulating the POST request.

makes sense? :)

thanks,
-bipin

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