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List:       gnupg-users
Subject:    Re: Flooding attack against synchronising keyservers
From:       Andrew Gallagher via Gnupg-users <gnupg-users () gnupg ! org>
Date:       2023-04-21 13:35:40
Message-ID: 56BC8465-6A22-41ED-86F6-595C473253D8 () andrewg ! com
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[Attachment #2 (multipart/signed)]


Hi, all.

pgpkeys.eu is fully operational, is accepting key submissions and is syncing with two \
similarly recovered peers. The number of keys in the dataset is back to pre-flooding \
levels, and site reliability has been significantly improved.

If you are an operator and need assistance recovering your system, please get in \
touch.

Thanks,
A

> On 27 Mar 2023, at 18:47, Andrew Gallagher via Gnupg-users <gnupg-users@gnupg.org> \
> wrote: 
> Signed PGP part
> Hi, everyone.
> 
> The synchronising keyserver network has been under an intermittent flooding attack \
> for the past five days, resulting in the addition of approximately 3 million \
> obviously-fake OpenPGP keys to the SKS dataset. The fake keys are currently being \
> submitted multiple times per second via a large number of Tor exit relays, making \
> them difficult to block using normal abuse mitigations. If unaddressed, this will \
> eventually fill up the disk of all public synchronising servers. 
> Effective immediately, pgpkeys.eu has been temporarily disconnected from all its \
> peers, and is blocking all key submissions. It will remain available for key \
> lookups but will not allow key updates while the flooding attack continues. 
> I strongly recommend that other keyserver operators take similar measures, until a \
> more permanent solution can be deployed. 
> A


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