[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <555A6B2A.1020205@gmail.com>
Date: Mon, 18 May 2015 15:43:54 -0700
From: Stanislav Malyshev <smalyshev@...il.com>
To: Andrea Palazzo <andrea.palazzo@...el.it>
CC: oss-security@...ts.openwall.com, security@....net
Subject: Re: CVE Request + Advisory: PHP str_repeat() sign mismatch based
memory corruption
Hi!
> About code execution, I haven't had the chance to focus on actual
> exploitation yet (I surely will in the near future), but as you can see
> from the original report (https://bugs.php.net/bug.php?id=69403), I
> pointed out several cases in which working on a so-crafted zval would
> lead to invalid memory access (with user controlled values as well), so
> I am pretty confident it is achievable.
These examples all seem to require specific code (like
'md5(str_repeat("a", 4294967294-1));') to be run. The probability that
applications would contain this specific code with str_repeat argument
controlled by remote user seems to be pretty low. However, if you can
show exploiting this on a code of an application that is not specially
crafted to demonstrate this issue, or at least resembles code that is
likely to be deployed in a real application, I will gladly change my
opinion.
--
Stas Malyshev
smalyshev@...il.com
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
