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Date: Thu, 28 Sep 2023 16:42:33 -0400
From: Demi Marie Obenour <demi@...isiblethingslab.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2023-5217: Heap buffer overflow in vp8
encoding in libvpx
On Thu, Sep 28, 2023 at 11:37:23AM -0700, Alan Coopersmith wrote:
> Google has announced another media parsing bug, this time correctly documenting
> both the base library and Chrome versions affected in the CVE.
>
> https://www.cve.org/CVERecord?id=CVE-2023-5217 states:
>
> Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to
> 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially
> exploit heap corruption via a crafted HTML page.
> (Chromium security severity: High)
>
> Unfortunately, the bug report it points to is restricted access still:
> https://crbug.com/1486441
>
> But the Chrome release notes state:
> Google is aware that an exploit for CVE-2023-5217 exists in the wild.
> https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_27.html
>
> Mozilla has put out their own security advisory at
> https://www.mozilla.org/en-US/security/advisories/mfsa2023-44/
> and delivered fixes in Firefox 118.0.1, Firefox ESR 115.3.1,
> Firefox Focus for Android 118.1, and Firefox for Android 118.1.
>
> https://bugzilla.mozilla.org/show_bug.cgi?id=1855550 is also still
> restricted access.
>
> It does not appear that libvpx 1.13.1 has been released yet, but there
> are two commits in its git repo with the 1486441 bug id listed:
>
> https://github.com/webmproject/libvpx/commit/3fbd1dca6a4d2dad332a2110d646e4ffef36d590
> https://github.com/webmproject/libvpx/commit/af6dedd715f4307669366944cca6e0417b290282
>
> Mozilla's commit references these two libvpx commit ids as well:
> https://hg.mozilla.org/mozilla-central/rev/c53f5ef77b62b79af86951a7f9130e1896b695d2
How long will it take for corporations to accept that writing media
codecs in C, C++, or any other memory-unsafe language is a fundamentally
bad idea, and that it is better to rewrite the codecs in a safe language
(such as Wuffs or Rust) than to try to secure the existing ones?
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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