Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2019-6477

Severity CVSS v4.0:
Pending analysis
Type:
CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
26/11/2019
Last modified:
07/11/2023

Description

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).

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* 9.11.7 (including) 9.11.12 (including)
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* 9.14.1 (including) 9.14.7 (including)
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* 9.15.0 (including) 9.15.5 (including)
cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.6:p1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.6:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.12.4:p1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.12.4:p2:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools