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Dear Sir or Madam,
the Portmapper service (portmap, rpcbind) is required for mapping RPC
requests to a network service. The Portmapper service is needed e.g.
for mounting network shares using the Network File System (NFS).
The Portmapper service runs on port 111 tcp/udp.
In addition to being abused for DDoS reflection attacks, the
Portmapper service can be used by attackers to obtain information
on the target network like available RPC services or network shares.
Over the past months, systems responding to Portmapper requests from
anywhere on the Internet have been increasingly abused DDoS reflection
attacks against third parties.
Please find below a list of affected systems hosted on your network.
The timestamp (timezone UTC) indicates when the openly accessible
Portmapper service was identified.
We would like to ask you to check this issue and take appropriate
steps to secure the Portmapper services on the affected systems or
notify your customers accordingly.
If you have recently solved the issue but received this notification
again, please note the timestamp included below. You should not
receive any further notifications with timestamps after the issue
has been solved.
Additional information on this notification, advice on how to fix
reported issues and answers to frequently asked questions:
<https://reports.cert-bund.de/en/>
This message is digitally signed using PGP.
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Please note:
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Affected systems on your network:
Format: ASN | IP | Timestamp (UTC) | RPC response
xx.xx.xx.xx | 2020-11-21 05:32:49 | 100000 4 111/udp; 100000 3 111/udp; 100000 2 111/udp; 100000 4 111/udp; 100000 3 111/udp; 100000 2 111/udp;
Mit freundlichen Gren / Kind regards
Team CERT-Bund
Bundesamt fr Sicherheit in der Informationstechnik
Federal Office for Information Security (BSI)
Referat OC25 - CERT-Bund
Godesberger Allee 185-189, 53175 Bonn, Germany

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