Published: 29 October 2020

A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.



CVSS 3 base score: 6.5


Package Release Status
Launchpad, Ubuntu, Debian
Released (4.11.15,4.12.9,4.13.1)
Ubuntu 21.04 (Hirsute Hippo)
Released (2:4.12.5+dfsg-3ubuntu4.1)
Ubuntu 20.10 (Groovy Gorilla)
Released (2:4.12.5+dfsg-3ubuntu4.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2:4.11.6+dfsg-0ubuntu1.6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.21)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (2:4.3.11+dfsg-0ubuntu0.16.04.32)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11)