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Date: Wed, 18 Nov 2015 12:15:41 -0500 (EST)
From: cve-assign@...re.org
To: peter@...e-magic.net
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request for path traversal / info leak bug in Spiffy web server

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> http://lists.gnu.org/archive/html/chicken-announce/2015-11/msg00000.html

> if you are using awful,
> chickadee, pastiche, qwiki, websockets or any other egg that uses Spiffy
> as HTTP server, your server is vulnerable as well.

> Spiffy 5.4 eliminates the
> vulnerability without requiring the fix for the CHICKEN core.

Use CVE-2015-8235 for the Spiffy vulnerability.


> The unfortunate cause of this is that some CHICKEN core
> procedures are misbehaving: when passed a file that starts with a
> backslash, some path manipulation procedures incorrectly
> *replace* the backslash with a slash. This has the effect of
> injecting a path separator into a path component that was
> supposed to be "atomic". This results in the path component
> being reinterpretated as two components.
> 
> The issue with the CHICKEN core procedures has been addressed by
> edd4926bb4f4c97760a0e03b0d0e8210398fe967 in the git repository, but it
> is not in any stable release yet.
> 
> http://code.call-cc.org/cgi-bin/gitweb.cgi?p=chicken-core.git;a=commit;h=edd4926bb4f4c97760a0e03b0d0e8210398fe967

If this is a CHICKEN core vulnerability, it needs a separate CVE ID.
The description above -- especially the 'supposed to be "atomic"'
comment -- suggests that the code is unambiguously wrong, but the
commit message presents the issue differently. Also, it appears that
introducing '/' characters into strings is a general problem for any
program that prohibits only '/' characters in user-supplied filenames
(e.g., because the program, for whatever reason, can only be used on
UNIX platforms). Is there a rationale for not considering this a
CHICKEN vulnerability?

- -- 
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 ]
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