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Re: Re: Insecure temp files usage in phusion passenger (other than CVE-2013-2119)
From: Kurt Seifried <kseifried () redhat com>
Date: Tue, 16 Jul 2013 11:38:41 -0600

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On 07/15/2013 08:37 AM, Raphael Geissert wrote:
Hi again,

On 10 June 2013 16:54, Raphael Geissert <geissert () debian org>
wrote:
While looking at  CVE-2013-2119 I noticed that Phusion Passenger 
2.2.11's ext/common/Utils.cpp makeDirTemp() uses mkdir(1) to
create directories in /tmp (e.g. /tmp/phusion.$$) for use by the
application and web server. A local user could create the
directories and have write access to directories, and possibly
files used by the application. I haven't confirmed, but I guess
this would allow some sort of privilege escalation to the user
executing the application or at least access to otherwise
restricted data.

Additionally, some of the subdirectories might be chown(2)ed to
a different user even if the directory already existed (it chowns
iff mkdir(1) returns 0). Not sure if it could have an impact,
however.

After talking to upstream, the above issue with the temp directory
has been fixed in 4.0.6 (release withdrawn and replaced by 4.0.7
due to a regression), and a regression fixed in 4.0.8[2]. The issue
was tracked as #910[3].

Could a CVE id be assigned then?

It allows a local user to DoS the service or to take over its
traffic.

[1]http://blog.phusion.nl/2013/07/04/phusion-passenger-4-0-6-released/


Bug fix:
https://github.com/phusion/passenger/commit/5483b3292cc2af1c83033eaaadec20dba4dcfd9b
[2]http://blog.phusion.nl/2013/07/09/phusion-passenger-4-0-8-released/


Regression fix:
https://github.com/phusion/passenger/commit/9dda49f4a3ebe9bafc48da1bd45799f30ce19566


[3]https://code.google.com/p/phusion-passenger/issues/detail?id=910

Cheers, -- Raphael Geissert - Debian Developer www.debian.org -
get.debian.net


Please use CVE-2013-4136 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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