CVE-2020-1700

A flaw was found in the way the Ceph RGW Beast front-end handles unexpected disconnects. An authenticated attacker can abuse this flaw by making multiple disconnect attempts resulting in a permanent leak of a socket connection by radosgw. This flaw could lead to a denial of service condition by pile up of CLOSE_WAIT sockets, eventually leading to the exhaustion of available resources, preventing legitimate users from connecting to the system.

Mitigation

If Beast front end is in use, switch to CivetWeb to mitigate the issue. The following is an example of the /etc/ceph/ceph.conf file:

<snip>
…
[client.rgw.node1]
rgw frontends = civetweb
…
</snip>