Date: Sun, 25 Sep 2011 18:38:40 +0200 From: Rasmus Lerdorf <rasmus@....net> To: Pierre Joye <pierre.php@...il.com> CC: Zeev Suraski <zeev@...d.com>, Vincent Danen <vdanen@...hat.com>, "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>, "security@....net" <security@....net>, Stas Malyshev <smalyshev@...arcrm.com> Subject: Re: CVE request: is_a() function may allow arbitrary code execution in PHP 5.3.7/5.3.8 On 09/25/2011 04:10 PM, Pierre Joye wrote: > On Sun, Sep 25, 2011 at 3:47 PM, Zeev Suraski <zeev@...d.com> wrote: > >> There aren't any security issues in PHP in that context. Assigning a CVE to PHP in that context would create the impression that there is indeed an issue in PHP here. >> It's not a matter of who's 'guilty' in terms of positioning - but in terms of where the actual security issue resides. And it does not reside in PHP. >> >> So I agree with Stas, it doesn't make sense to have a CVE here. Otherwise, almost every change we make, including bug fixes, could somehow result in some faulty piece of code somewhere becoming vulnerable to something. > > The whole point is that some code was not having any issue before this > change. If the check was done earlier using is_a then this unexpected > behavior will happen, and that actually causes a security issue in > existing working code. The example in the blog post is very good one, > it clearly shows that the impact on existing code is not only about > wrongly implemented autoloader, or someone not disabling > allow_url_fopen (I can imagine local file include being an issue as > well under some circumstances). > > All in all, there is no shame or bad image to get a new CVE for > something like that, I even see it as a good thing as it will: I didn't read the thread from the beginning, but is there an actual exploit here? Presumably the autoloader code in question isn't doing an fopen/eval to execute the code and since allow_url_include is disabled by default, remote includes aren't an issue in the default install. So are we talking about the tiny number of people who have explicitly enabled allow_url_include and are running the code with this bad autoloader? -Rasmus
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