Re: CVE-2021-36699 report

[<tomas@tuxteam.de>]

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On Mon, Apr 24, 2023 at 09:27:34PM +0000, fuomag9 wrote:
> Hi,
> 
> This email was forwarded to you as suggested by simon@josefsson.org <mailto:simon@josefsson.org> as I was forwarded to this person when contacting security@gnu.org
> 
> 
> 
> Hi,
> I’m a security researcher and I’ve searched for a way to contact the emacs security team but I’ve not found any information online, so I’m reporting this issue here.
> I’ve discovered a buffer overflow in GNU Emacs 28.0.50 (at the time of writing the exploit still works on GNU Emacs 28.2)
> The issue is inside the --dump-file functionality of emacs, in particular dump_make_lv_from_reloc at pdumper.c:5239
> Attached to this email there's is payload used to make the vulnerability work (if emacs complains about a signature error you need to replace the hex bytes inside the payload with the expected one, since every emacs binary will expect a different signature).

[...]

Hm. The way I see this: the dump file is part of the
Emacs program. Creating a vulnerability by replacing
part of a program (e.g. a shared library) seems to be
possible everywhere, no?

Cheers
-- 
t

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