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Date: Mon, 06 Feb 2023 21:25:28 +0100
From: Steffen Nurpmeso <>
To: Helmut Grohne <>
Subject: Re: sox: patches for old vulnerabilities

Hello Helmut.

Helmut Grohne wrote in
 |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.
 |> (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.

Would be very nice, i use it almost daily for over twenty years.
(But .. mostly for playing sounds, i am not a sophisticated sound
engineer etc etc.)

Wonderful, thank you very much for the additional work, i first
thought hcom would now miss the INT32 max check, but that was also
upstream.  (Thanks, i really have _zero_ idea of the code.)

I hope it is ok, i still port [master], but now with the
additional patch as attached, that has your name on it.


|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)

View attachment "grohne-sox.patch" of type "text/x-diff" (6620 bytes)

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