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Cracking tool milks weakness to reveal some Mega passwords
From: InfoSec News <alerts () infosecnews org>
Date: Wed, 23 Jan 2013 01:52:14 -0600 (CST)
By Dan Goodin
Jan 22 2013
Yet another security researcher is poking holes in the security of Mega, this
time by pointing out that the confirmation messages e-mailed to new users can
in many cases be cracked to reveal their password and take over their Mega
Steve "Sc00bz" Thomas, the researcher who uncovered the weakness, has released
a program called MegaCracker that can extract passwords from the link contained
in confirmation e-mails. Mega e-mails a link to all new users and requires that
they click on it before they can use the cloud-based storage system, which
boasts a long roster of encryption and security protections. Security
professionals have long considered it taboo to send passwords in either
plaintext or as cryptographic hashes in e-mails because of the ease attackers
have in intercepting unencrypted messages sent over Internet.
Despite that admonishment, the link included in Mega confirmation e-mails
contains not only a hash of the password, but it also includes other sensitive
data, such as the encrypted master key used to decrypt the files stored in the
account. MegaCracker works by isolating the AES-hashed password embedded in the
link and attempting to guess the plaintext that was used to generate it.
"Since e-mail is unencrypted, anyone listening to the traffic can read the
message," Thomas told Ars. "It makes no sense to send a confirmation link with
a hash of your password."
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- Cracking tool milks weakness to reveal some Mega passwords InfoSec News (Jan 23)