We received a security alert from the German Federal Office for
Information Security (BSI). Please see the original report included
below for details.
Please investigate and solve the reported issue. It is not required
that you reply to either us or the BSI. If the issue has been fixed
successfully, you should not receive any further notifications.
Additional information is provided with the HOWTOs referenced in the
- In case of further questions, please contact
email@example.com and keep the ticket number of the original report
[CB-Report#...] in the subject line. Do not reply
<firstname.lastname@example.org> as this is just the sender address for
the reports and messages sent to this address will not be read.
On 10 Oct 10:37, email@example.com wrote:
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.
Affected systems on your network:
Format: ASN | IP | Timestamp (UTC) | RPC response
24940 | 2018-10-09 05:35:32 | 100000 4 111/udp; 100000 3 111/udp; 100000 2 111/udp; 100000 4 111/udp; 100000 3 111/udp; 100000 2 111/udp;
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.
停止进程 $ systemctl stop rpcbind.socket $ systemctl stop rpcbind 禁止随开机启动 $ systemctl disable rpcbind.socket $ systemctl disable rpcbind