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Message-ID: <1b440233-e567-4b47-b1c8-ffc421f30cf9@alexburke.ca>
Date: Wed, 6 Jul 2022 13:06:44 +0000 (UTC)
From: Alexander Burke <alex@...xburke.ca>
To: oss-security@...ts.openwall.com
Subject: Re: Re: DO NOT OPEN PREVIOUS MAIL Re:
Denial of service in GnuPG
> I would suggest ditching it outright.
Don't let your dreams be dreams!
----------------------------------------
Jul 6, 2022 13:33:09 Demi Marie Obenour <demi@...isiblethingslab.com>:
> On Wed, Jul 06, 2022 at 06:10:32AM -0000, Tavis Ormandy wrote:
>> On 2022-07-04, Jakub Wilk wrote:
>>> As a data point, if Mutt has pgp_auto_decode=yes ("automatically attempt
>>> to decrypt traditional PGP messages") in the config, it will trigger the
>>> DoS when you view the message.
>>
>> Hmm - I think you don't even need auto_decode, because x-action parameters
>> can trigger automatic decryption in mutt.
>>
>> There's an example message here: https://gitlab.com/muttmua/mutt/-/issues/405
>>
>>> (And it seems that if you lose patience waiting for the message to show
>>> up and press ctrl+backslash in attempt to make it quit, it will actually
>>> hang forever.)
>>>
>>
>> I think you need at least something like max-output 104857600 in
>> gnupg.conf if you don't want trivial DoS pranks to be possible :)
>>
>> Tavis.
>
> I don't think this one is impacted by max-output. Worse, I was told
> “Not a bug, sorry” by Werner.
>
> Was adding compression to PGP even a good idea in the first place?
> Becuase it seems to have some of the same problems that compression in
> TLS and SSH do, not to mention creating a trivial DoS. If it were not
> for OpenPGP being an archival format I would suggest ditching it
> outright.
> --
> Sincerely,
> Demi Marie Obenour (she/her/hers)
> Invisible Things Lab
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