[DragonFlyBSD - Bug #2278] "Password hashing weakness in DF" (Matthias Schmidt)

[Matthew Dillon via Redmine]

Issue #2278 has been updated by Matthew Dillon.


:Issue #2278 has been reported by Robin Carey.
:
:----------------------------------------
:Bug #2278: "Password hashing weakness in DF" (Matthias Schmidt)
:http://bugs.dragonflybsd.org/issues/2278

    After some coordination on IRC, Sam committed the linux sha256 and
    sha512 code ($5$ and $6$) and set the default to the new sha512
    code.  The broken sha256/512 code ($3$ and $4$) is still present
    in order to properly decrypt any passwords using the broken hash,
    but can no longer be used to encrypt new passwords.

					-Matt
----------------------------------------
Bug #2278: "Password hashing weakness in DF" (Matthias Schmidt)
http://bugs.dragonflybsd.org/issues/2278

Author: Robin Carey
Status: Closed
Priority: Normal
Assignee: 
Category: 
Target version: 


Further to the email posted by Matthias Schmidt to DragonFly users list
(17/01/2012):


I had a look at (GitWeb) the source code:

lib/libcrypt/crypt-sha256.c

and

lib/libcrypt/crypt-sha512.c


Both of those C files have bugs in them: "crypt-sha256.c:":

....
/* Then the magic string */
SHA256_Update(&ctx, magic, sizeof(magic));
....

Should be strlen(magic) instead of sizeof(magic).
-----

And practically the same bug in: "crypt-sha512.c":

....
/* Then the magic string */
SHA512_Update(&ctx, magic, sizeof(magic));
.....

Should be strlen(magic) instead of sizeof(magic).
------

There might be other bugs - I didn't really check for any .....

-- 
Sincerely,

Robin Carey BSc


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