ISC BIND 9.x < 9.9.9-P2 / 9.10.x < 9.10.4-P2 / 9.11.0a3 < 9.11.0b2 lwres Query DoS

medium Nessus Plugin ID 92493
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Synopsis

The remote name server is affected by a denial of service vulnerability.

Description

According to its self-reported version number, the installation of ISC BIND running on the remote name server is 9.x prior to 9.9.9-P2, 9.10.x prior to 9.10.4-P2, or 9.11.0a3 prior to 9.11.0b2. It is, therefore, affected by an error in the lightweight resolver (lwres) protocol implementation when resolving a query name that, when combined with a search list entry, exceeds the maximum allowable length. An unauthenticated, remote attacker can exploit this to cause a segmentation fault, resulting in a denial of service condition. This issue occurs when lwresd or the the named 'lwres' option is enabled.

Solution

Upgrade to ISC BIND version 9.9.8-P3 / 9.9.8-S4 / 9.10.3-P3 or later.

Note that BIND 9 version 9.9.9-S3 is available exclusively for eligible ISC Support customers.

See Also

https://kb.isc.org/article/AA-01393

Plugin Details

Severity: Medium

ID: 92493

File Name: bind9_9104_p2.nasl

Version: 1.13

Type: remote

Family: DNS

Published: 7/21/2016

Updated: 11/14/2019

Dependencies: bind_version.nasl

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2016-2775

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 7/18/2016

Vulnerability Publication Date: 7/18/2016

Reference Information

CVE: CVE-2016-2775

IAVA: 2017-A-0004