[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
