CVE-2019-6477

Published: 20 November 2019

With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
bind9
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.04 LTS (Focal Fossa)
Released (1:9.11.5.P4+dfsg-5.1ubuntu4)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1:9.11.3+dfsg-1ubuntu1.11)
Ubuntu 16.04 LTS (Xenial Xerus) Not vulnerable
(code not present)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(code not present)

Notes

AuthorNote
mdeslaur
introduced in https://github.com/isc-projects/bind9/commit/761d135ed686601f36fe3d0d4aaa6bf41287bb0f

References