[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Fri, 27 Feb 2015 23:11:46 -0500 (EST)
From: cve-assign@...re.org
To: tyhicks@...onical.com, sylvain.pelissier@...il.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: eCryptfs key wrapping help to crack user password
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
> In this case, a wrapping key is generated from the user password
> using the hash function SHA-512 applied 65536 times. By default, the
> wrapping key is hashed with the default fixed salt
> (0x0011223344556677) and stored in the a file.
> This was already noticed in bug :
> https://bugs.launchpad.net/ecryptfs/+bug/906550
> https://bugs.launchpad.net/ecryptfs/+bug/906550/comments/5
> all installations end up wrapping (encrypting) the mount passphrase
> with the user login password and the DEFAULT SALT VALUE. A unique salt
> value among almost all installations makes them a convenient target
> for a rainbow table attack on the wrapped-passphrase file.
> I got here because I am dabbling with a config package to implement
> mandatory eCryptfs encrypted home for all users of a system
Use CVE-2014-9687. Our interpretation is that this is a vendor CVE
request based on a vendor's perspective that ecryptfs-setup-private's
use of the default salt was never the intended behavior. (For example,
http://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/view/head:/doc/beginners_guide/ecryptfs_beginners_guide.tex
says "It is highly advised that you also provide a salt along with the
password, which will help make an attack against your files harder
than if you use the default salt.")
- --
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (SunOS)
iQEcBAEBAgAGBQJU8T+GAAoJEKllVAevmvmsK88H/RM59bZPtTnS7oPAsXrAmYeY
7zx+ZkmYxwOpTr5HQg/IZw16MnSb83GG7YtRa6XjTadf8jBYuzZpHxAnWncjo+em
6Q3fmTG9yayBcZVV/7/99+mvOcbHE+sF20qg/imRawHUEWQx8wVxk2Z/G6Ef4Eff
kM2fhxKJRfRo1Xb7r3ZPsnQzA2xz3aO9EZaqbsGsQCSoFp9yEmIqiCHL7f8datOw
lOfLJX4U+au/IMMxGkGr+gZZYMCVZb7TUnQDIQXDB1oC4W6Lk5yWfKOqI/3pmaie
muK0BpzE5P4RMLgnP2voHuvOXM9WnjlTeV1wC80qYMVP9UJsjWiaMIV5d1shxYw=
=RVyA
-----END PGP SIGNATURE-----
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
