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CVE-2019-6477

Publication date 20 November 2019

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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).

Read the notes from the security team

Status

Package Ubuntu Release Status
bind9 19.10 eoan
Fixed 1:9.11.5.P4+dfsg-5.1ubuntu2.1
19.04 disco
Fixed 1:9.11.5.P1+dfsg-1ubuntu2.6
18.04 LTS bionic
Fixed 1:9.11.3+dfsg-1ubuntu1.11
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

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

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references