full-disclosure - Re: MySQL (Linux) Heap Based Overrun PoC Zeroday

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Message-ID: <CAH8yC8=_9Bz2+6bA3Q5f2f9=7CEsCzsk+ydMDFY4oLULY2==Xg@mail.gmail.com>
Date: Sat, 1 Dec 2012 16:56:42 -0500
From: Jeffrey Walton <noloader@...il.com>
To: king cope <isowarez.isowarez.isowarez@...glemail.com>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	submit@...sec.com, todd@...ketstormsecurity.org
Subject: Re: MySQL (Linux) Heap Based Overrun PoC Zeroday

Hi Kingcope,

# As seen below $edx and $edi are fully controlled,
# the current instruction is
# => 0x83a6b24 <free_root+180>:   mov    (%edx),%edi
# this means we landed in a place where 4 bytes can be controlled by 4 bytes
# with this function pointers and GOT entries can be rewritten to
execute arbritrary code

Out of curiosity, is this exploitable when using hardened toolchain
settings? Specifically, -z,noexecheap, -z,now, and -z,relro? For
no-exec heaps., you need to be on Gentoo or other platforms which
offer the remediation.

Jeff

On Sat, Dec 1, 2012 at 4:26 PM, king cope
<isowarez.isowarez.isowarez@...glemail.com> wrote:
> (see attachment)
>
> Cheerio,
>
> Kingcope
>
> _______________________________________________
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