[atlas] Emergency RIPE Atlas firmware upgrade

Dear RIPE Atlas users,

We want to let you know about a recent issue in the RIPE Atlas system
involving an open port on the latest generation (v3) probes.

Due to an issue with the latest firmware release, a subset of the v3 probes
were listening to incoming connections on an open port that should not have
been left open. As a secondary measure, however, access to this port
required credentials only available to the RIPE Atlas probe developers. It
therefore never presented open access to the probes. This port (SSH) is used
for development purposes in our internal development environment.

We upgraded the v3 probes to a new, corrected firmware version, and improved
the checks in our firmware release process. We would like to thank
ZeelandNet for reporting the issue to us.

We want to assure you that the security of the RIPE Atlas system is
important to us. We are continually improving the controlling infrastructure
as well as the probes themselves in order to prevent vulnerabilities. We
apologise for this issue and want to stress that no probes were actually
affected in any way.

You can learn more about the security of the RIPE Atlas system on our
dedicated security page at: https://atlas.ripe.net/docs/security/

Thank you for your continuing support of RIPE Atlas.

Regards,
Robert Kisteleki
RIPE NCC