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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