[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <loom.20140203T194406-369@post.gmane.org>
Date: Mon, 3 Feb 2014 19:19:06 +0000 (UTC)
From: mancha <mancha1@...h.com>
To: oss-security@...ts.openwall.com
Subject: Re: OpenSSH J-PAKE vulnerability (no cause for panic! remain calm!)
Kurt Seifried <kseifried@...> writes:
> On 01/29/2014 06:50 AM, cve-assign@... wrote:
> > Use CVE-2014-1692. The CVE description will indicate that the
> > issue requires an unusual installation.
> >
> >> As I understand it this can be enabled via code edit/gcc command
> >> line options, so not sure if this qualified for a CVE or not
> >> (vuln in code, yes, is code reachable? not under any default
> >> setup, and even on non-default you have to go pretty far off to
> >> enable it).
> >
> > An impact on the default installation isn't necessary.
> > Vulnerabilities that occur only after the user modifies code aren't
> > eligible for a CVE. However, if there's some type of "installation
> > option" mentioned by the vendor, someone may have chosen that
> > option, and it may be worthwhile to track the issue with a CVE. The
> > nature of an "installation option" obviously varies widely across
> > both open-source and closed-source products.
> >
> > In this case, there's:
> >
> >> http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/Makefile.inc
> >
> >> Add support for an experimental zero-knowledge password
> >> authentication method using the J-PAKE protocol ...
> >
> >> This is experimental, work-in-progress code and is presently
> >> compiled-time disabled (turn on -DJPAKE in Makefile.inc).
> >
> >>
http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/Makefile.inc?rev=1.41;content-type=text%2Fplain
> >
> >> #CFLAGS+= -DJPAKE
> >
> > This is close to the edge of what "installation option" means, but
> > our feeling is that the vendor wouldn't have provided that #CFLAGS
> > line at all unless it were expected that an end user might want to
> > make the one-character change.
>
> Just to close this email thread, Mitre assigned one:
>
> http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1692
>
This CVE assignment puzzles me. Relevant code was: 1) never enabled,
2) never advertised in release notes, and 3) never had a
configuration option. To enable it, a user would have to pro-actively
edit code (more than merely a configure flag). Note: I *did* read
MITRE's justification on this last point.
Also, an attacker would need to make EVP_Digest* fail. Is there
a known way to achieve this?
Finally, the NVD entry
(https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-1692)
doesn't make sense. J-PAKE experimental code wasn't in the code-base
until OpenSSH 5.2 (iirc) yet versions back to 1.2 are listed as
vulnerable. Also, a CVSS score of 7.5 (High)? I know this is
orthogonal to the actual CVE assignment. Still...weird.
I don't have a horse in this race but the entire situation strikes
me incongruent.
--mancha
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.
