CVE-2019-6477
Publication date 20 November 2019
Last updated 24 July 2024
Ubuntu priority
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).
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| bind9 | ||
| 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)
- USN-4197-1
- Bind vulnerability
- 21 November 2019