full-disclosure - Re: python <= 2.5.1 standart librairy multiples int overflow, heap overflow in imageop module

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Date: Sun, 16 Sep 2007 00:24:04 -0700
From: Andrew Farmer <andfarm@...il.com>
To: "Slythers Bro" <slythers@...il.com>
Cc: Full-Disclosure dis <full-disclosure@...ts.grok.org.uk>
Subject: Re: python <= 2.5.1 standart librairy multiples
	int overflow, heap overflow in imageop module

On 15 Sep 07, at 16:53, Slythers Bro wrote:
> The module imageop contains a lots of int overflow, which result in  
> heap overflow, and maybe memory dump.
> The files imageop.c and rbgimgmodule.c are examples.
<snip>

The real question: Does anybody actually use those modules? Most  
Python programs that I've seen that do image processing use other  
methods, like PIL or calling out to Imagemagick.

A bit of searching on Google Code Search didn't find me anything that  
actually used imageop or rgbimgmodule except test cases for those  
modules. rgbimgmodule isn't even part of a standard build of Python 2.5.

Remember that Python is *not* a managed language - there's no  
guarantees of safety inherent in the language. In fact, there are  
easier ways to execute native code: take a look at ctypes, for  
example. While I'd definitely classify the behavior you've identified  
as a bug, it's unlikely to be exploitable in the context of any  
programs which use it (if, indeed, there are any).

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