oss-security - Re: OpenSSL X.509 Email Address 4-byte Buffer Overflow (CVE-2022-3602), X.509 Email Address Variable Length Buffer Overflow (CVE-2022-3786)

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Message-ID: <tjtkiu$jeu$1@ciao.gmane.io>
Date: Wed, 2 Nov 2022 11:33:50 -0000 (UTC)
From: Tavis Ormandy <taviso@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: OpenSSL X.509 Email Address 4-byte Buffer Overflow
 (CVE-2022-3602), X.509 Email Address Variable Length Buffer Overflow
 (CVE-2022-3786)

On 2022-11-01, Jeffrey Walton wrote:
> On Tue, Nov 1, 2022 at 3:55 PM Pavan Maddamsetti
><pavan.maddamsetti@...il.com> wrote:
>>
>> https://github.com/RustCrypto
>

I don't know rust, so serious question - if this same buggy punycode
routine had been written in rust, what would have happened?

- I assume you *could* write similar logic, but perhaps the argument is
  that idiomatic rust discourages it?
- Would rustc have been able to reason about the code well enough at
  compile time to error out?
- Just detect it at runtime and abort()?

If the answer is "error out", then I think that's a pretty convincing win.

Tavis.

-- 
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