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Date: Sun, 11 Oct 2015 12:29:25 -0400 (EDT)
From: cve-assign@...re.org
To: alessandro@...dini.me
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE Request: twig remote code execution

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> the symphony project released a security advisory for the Twig PHP library:
> http://symfony.com/blog/security-release-twig-1-20-0
> 
> The linked GitHub pull requests provides the fixes:
> https://github.com/twigphp/Twig/pull/1759
> 
> AFAICT there are least two issues: a remote code execution fixed by the "fixed
> sandbox security issue" patch, and at least another issue regarding access to
> "reserved macro names".
> 
> The RCE deserves a CVE IMO, but I'm not sure about the other one (or if it is
> indeed only one issue).

The MITRE CVE team doesn't have any straightforward way to satisfy CVE
requests about an uncertain set of vulnerabilities (e.g., "least two
issues" and "if it is indeed only one").

If the information had been broken down into specific independent
vulnerabilities with distinct discoverers, we would typically be able
to provide a separate CVE ID per discoverer; however, "I want to thank
James Kettle who was the first to report a RCE security issue, Alain
Tiemblo, Christophe Coevoet, and Fabien Potencier for finding more
possible and dangerous RCEs." doesn't really do that.

It's true that "Prevent importing or calling reserved macro names"
seems to correspond to a bug, but the listed references don't have any
statements about whether it's independently exploitable.

Similarly, the new code for "Accessing the environment from templates
is forbidden to prevent untrusted changes to the environment" in
a8a125ba9b31d20e8ad50e0d1078983ed7fa41a7 and
22500609b69a9f17a64102d9376cb114f706ee2f, which weren't mentioned in
the CVE request, seems like it is probably for a security-related bug
fix; however, again we don't know that it's independently exploitable.

So, what we'll do here is focus only on
30be07759a3de2558da5224f127d052ecf492e8f, which is described as "fixed
sandbox security issue" and suggests that the problem was that,
previously, a critical constraint of "A block must be a method on a
Twig_Template instance" wasn't being enforced. Use CVE-2015-7809 for
this 30be07759a3de2558da5224f127d052ecf492e8f issue.

- -- 
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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