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Date: Sun, 5 Feb 2023 13:13:50 +0100
From: Helmut Grohne <>
Subject: Re: sox: patches for old vulnerabilities


On Sat, Feb 04, 2023 at 12:19:14AM +0100, Steffen Nurpmeso wrote:
> But i was only wondering a bit, have you checked against the
> [master] branch?  For example

I did a (too) rough survey of the upstream repository and (too quickly)
concluded that it wouldn't help me with fixing these in Debian, so I
worked from Debian's fork. I should have made this more clear.

>   02-fix-resource-leak-hcom.patch

Still needed in git.

>   03-fix-regression-in-CVE-2017-11358.patch

I'll be replacing the Debian-specific, broken fix of CVE-2017-11358 with
the one committed upstream. Thanks.

>   04-fix-hcom-big-endian.patch#

Indeed, I should have revisited the upstream tree. Upstream also fixes a
double free and I'll be replacing my patch with the upstream one.

>   06-CVE-2021-33844.patch

The code is refactored, but I think the issue persists in wav_read_fmt
where wav->bitsPerSample isn't checked.

> and
>   07-CVE-2021-3643.patch

The hunk context changed and channels are now verified, but the size
validation is still missing. During further analysis I also found that
my patch is insufficient still.

If uc becomes 1, we assign it to v->size, later we pass 6 - v->size as
the second parameter to lsx_adpcm_init, which is used as an index into a
static array of 5 elements. We thus have an out-of-bounds read access
here. I don't yet know where exactly the check belongs as v->size == 1
may be valid in some contexts still.

Updated patch attached.

> The rest just apply fine, and 02- was needed here, 03- seemed an
> unrolled dup, 04- in parts (stdint via sox.h, but overflow, sure),
> it is too late to check the rest, 'will do tomorrow.

Thank you.

> (I an maintaining an official contrib now private sox port for
> CRUX Linux based upon 42b3557e13e0fe0 as of 20211029.)

I think it would be good to have a maintained upstream repository of sox
eventually. It seems like multiple distributions are maintaining
diverging patch piles now.


View attachment "CVE-2021-3643.patch" of type "text/x-diff" (672 bytes)

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