[FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-14:11.crypt
Jim Pirzyk
pirzyk at freeBSD.org
Fri Oct 24 19:37:20 UTC 2014
Is he the current security officer? If so it would have been nice to see these issues addressed in the Errata announcement.
I still don’t understand the reasons for backing out a change after 20 years.
- JimP
On Oct 24, 2014, at 12:43 PM, Adrian Chadd <adrian at freebsd.org> wrote:
> You mean like des@ ?
>
>
>
> -adrian
>
> On 24 October 2014 09:18, Jim Pirzyk <pirzyk at freebsd.org> wrote:
>> That statement is really irrelevant because this is the submitter, what was the crypt() behavior back in the 2.0 days? Did anyone in FreeBSD verify this statement? Why was that behavior not restored, as opposed to chaining the default encryption algorithm. If login.conf was lost, mangled, etc in the old days, you would still get md5/sha1/…/etc encryption, now you just get DES.
>>
>> I think the security implications of this change should have required a bigger review, like at least sign off from security-officer at freebsd.org
>>
>> If this was a POSIX compatibility issue, that should have been evaluated and reviewed properly. It feels there were not enough eyes on this change and if as you say this is not affected the default passwd algorithm, that should have also been noted in the Errata note.
>>
>> - JimP
>>
>> On Oct 24, 2014, at 8:48 AM, Ronald Klop <ronald-lists at klop.ws> wrote:
>>
>>> Hi,
>>>
>>> I have nothing to do with the actual coding, but please reread comment 7 from the bug report:
>>> 'This doesn't have anything common with system default password encryption, this is realized using /etc/login.conf and applications like passwd, etc.'
>>>
>>> Regards,
>>> Ronald.
>>>
>>> On Fri, 24 Oct 2014 15:21:48 +0200, Jim Pirzyk <pirzyk at freebsd.org> wrote:
>>>
>>>> I think this should be reopened and reverted. This is the wrong answer and has not taken into account the history of crypt() on FreeBSD. I point you to the svn log:
>>>>
>>>> http://svnweb.freebsd.org/base?view=revision&revision=4246
>>>>
>>>> and
>>>>
>>>> http://www.freebsd.org/releases/2.0/notes.html
>>>>
>>>> If password security for FreeBSD is all you need, and you have no
>>>> requirement for copying encrypted passwords from different hosts (Suns,
>>>> DEC machines, etc) into FreeBSD password entries, then FreeBSD's MD5
>>>> based security may be all you require! We feel that our default security
>>>> model is more than a match for DES, and without any messy export issues
>>>> to deal with. If you're outside (or even inside) the U.S., give it a try!
>>>>
>>>> We are reversing 20+ years of FreeBSD progress.
>>>>
>>>> - JimP
>>>>
>>>> On Oct 24, 2014, at 8:11 AM, Ronald Klop <ronald-lists at klop.ws> wrote:
>>>>
>>>>> See: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192277
>>>>>
>>>>> Regards,
>>>>> Ronald.
>>>>>
>>>>> On Fri, 24 Oct 2014 13:14:20 +0200, Jim Pirzyk <pirzyk at freebsd.org> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I was wondering if there is more information about this change? FreeBSD changed the default away from DES to MD5 back in the 1.1.5 -> 2.0 transition. It seems to me a downgrade and rewarding bad programming to be changing back to DES now. Also the proper course of action is to correct programs that make the wrong assumption about what crypt() changes.
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>> - JimP
>>>>>>
>>>>>> On Oct 22, 2014, at 4:07 PM, FreeBSD Errata Notices <errata-notices at freebsd.org> wrote:
>>>>>>
>>>>>>> Signed PGP part
>>>>>>> =============================================================================
>>>>>>> FreeBSD-EN-14:11.crypt Errata Notice
>>>>>>> The FreeBSD Project
>>>>>>>
>>>>>>> Topic: crypt(3) default hashing algorithm
>>>>>>>
>>>>>>> Category: core
>>>>>>> Module: libcrypt
>>>>>>> Announced: 2014-10-22
>>>>>>> Affects: FreeBSD 9.3 and FreeBSD 10.0-STABLE after 2014-05-11 and
>>>>>>> before 2014-10-16.
>>>>>>> Corrected: 2014-10-13 15:56:47 UTC (stable/10, 10.1-PRERELEASE)
>>>>>>> 2014-10-16 21:39:04 UTC (releng/10.1, 10.1-RC3)
>>>>>>> 2014-10-16 21:39:04 UTC (releng/10.1, 10.1-RC2-p2)
>>>>>>> 2014-10-16 21:39:04 UTC (releng/10.1, 10.1-RC1-p2)
>>>>>>> 2014-10-16 21:39:04 UTC (releng/10.1, 10.1-BETA3-p2)
>>>>>>> 2014-10-21 21:09:54 UTC (stable/9, 9.3-STABLE)
>>>>>>> 2014-10-21 23:50:46 UTC (releng/9.3, 9.3-RELEASE-p4)
>>>>>>>
>>>>>>> For general information regarding FreeBSD Errata Notices and Security
>>>>>>> Advisories, including descriptions of the fields above, security
>>>>>>> branches, and the following sections, please visit
>>>>>>> <URL:http://security.freebsd.org/>.
>>>>>>>
>>>>>>> I. Background
>>>>>>>
>>>>>>> The crypt(3) function performs password hashing. Different algorithms
>>>>>>> of varying strength are available, with older, weaker algorithms being
>>>>>>> retained for compatibility.
>>>>>>>
>>>>>>> The crypt(3) function was originally based on the DES encryption
>>>>>>> algorithm and generated a 13-character hash from an eight-character
>>>>>>> password (longer passwords were truncated) and a two-character salt.
>>>>>>>
>>>>>>> II. Problem Description
>>>>>>>
>>>>>>> In recent FreeBSD releases, the default algorithm for crypt(3) was
>>>>>>> changed to SHA-512, which generates a much longer hash than the
>>>>>>> traditional DES-based algorithm.
>>>>>>>
>>>>>>> III. Impact
>>>>>>>
>>>>>>> Many applications assume that crypt(3) always returns a traditional DES
>>>>>>> hash, and blindly copy it into a short buffer without bounds checks. This
>>>>>>> may lead to a variety of undesirable results including, at worst, crashing
>>>>>>> the application.
>>>>>>>
>>>>>>> IV. Workaround
>>>>>>>
>>>>>>> No workaround is available.
>>>>>>>
>>>>>>> V. Solution
>>>>>>>
>>>>>>> Perform one of the following:
>>>>>>>
>>>>>>> 1) Upgrade your system to a supported FreeBSD stable or release / security
>>>>>>> branch (releng) dated after the correction date.
>>>>>>>
>>>>>>> 2) To update your present system via a source code patch:
>>>>>>>
>>>>>>> The following patches have been verified to apply to the applicable
>>>>>>> FreeBSD release branches.
>>>>>>>
>>>>>>> a) Download the relevant patch from the location below, and verify the
>>>>>>> detached PGP signature using your PGP utility.
>>>>>>>
>>>>>>> # fetch http://security.FreeBSD.org/patches/EN-14:11/crypt.patch
>>>>>>> # fetch http://security.FreeBSD.org/patches/EN-14:11/crypt.patch.asc
>>>>>>> # gpg --verify crypt.patch.asc
>>>>>>>
>>>>>>> b) Apply the patch. Execute the following commands as root:
>>>>>>>
>>>>>>> # cd /usr/src
>>>>>>> # patch < /path/to/patch
>>>>>>>
>>>>>>> c) Recompile the operating system using buildworld and installworld as
>>>>>>> described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
>>>>>>>
>>>>>>> Restart all deamons using the library, or reboot the system.
>>>>>>>
>>>>>>> 3) To update your system via a binary patch:
>>>>>>>
>>>>>>> Systems running a RELEASE version of FreeBSD on the i386 or amd64
>>>>>>> platforms can be updated via the freebsd-update(8) utility:
>>>>>>>
>>>>>>> # freebsd-update fetch
>>>>>>> # freebsd-update install
>>>>>>>
>>>>>>> VI. Correction details
>>>>>>>
>>>>>>> The following list contains the revision numbers of each file that was
>>>>>>> corrected in FreeBSD.
>>>>>>>
>>>>>>> Branch/path Revision
>>>>>>> -------------------------------------------------------------------------
>>>>>>> stable/9/ r273425
>>>>>>> releng/9.3/ r273438
>>>>>>> stable/10/ r273043
>>>>>>> releng/10.1/ r273187
>>>>>>> -------------------------------------------------------------------------
>>>>>>>
>>>>>>> To see which files were modified by a particular revision, run the
>>>>>>> following command, replacing NNNNNN with the revision number, on a
>>>>>>> machine with Subversion installed:
>>>>>>>
>>>>>>> # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
>>>>>>>
>>>>>>> Or visit the following URL, replacing NNNNNN with the revision number:
>>>>>>>
>>>>>>> <URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
>>>>>>>
>>>>>>> VII. References
>>>>>>>
>>>>>>> The latest revision of this Errata Notice is available at
>>>>>>> http://security.FreeBSD.org/advisories/FreeBSD-EN-14:11.crypt.asc
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> freebsd-announce at freebsd.org mailing list
>>>>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-announce
>>>>>>> To unsubscribe, send any mail to "freebsd-announce-unsubscribe at freebsd.org"
>>>>>>
>>>>>> --- @(#) $Id: dot.signature,v 1.15 2007/12/27 15:06:13 pirzyk Exp $
>>>>>> __o jim at pirzyk.org --------------------------------------------------
>>>>>> _'\<,_
>>>>>> (*)/ (*) I'd rather be out biking.
>>>>
>>>> --- @(#) $Id: dot.signature,v 1.15 2007/12/27 15:06:13 pirzyk Exp $
>>>> __o jim at pirzyk.org --------------------------------------------------
>>>> _'\<,_
>>>> (*)/ (*) I'd rather be out biking.
>>
>> --- @(#) $Id: dot.signature,v 1.15 2007/12/27 15:06:13 pirzyk Exp $
>> __o jim at pirzyk.org --------------------------------------------------
>> _'\<,_
>> (*)/ (*) I'd rather be out biking.
>>
--- @(#) $Id: dot.signature,v 1.15 2007/12/27 15:06:13 pirzyk Exp $
__o jim at pirzyk.org --------------------------------------------------
_'\<,_
(*)/ (*) I'd rather be out biking.
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