ISC BIND 9.9.6-S2 DNSSEC Validation DoS

medium Nessus Plugin ID 81488

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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 remote installation of BIND (via DNSco) is potentially affected by a denial of service vulnerability due to an error relating to DNSSEC validation and the managed-keys feature. A remote attacker can trigger an incorrect trust-anchor management scenario in which no key is ready for use, resulting in an assertion failure and daemon crash.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to BIND version 9.9.6-S3 or later.

Alternatively, as a workaround, do not use 'auto' for the dnssec-validation or dnssec-lookaside options and do not configure a managed-keys statement.

Plugin Details

Severity: Medium

ID: 81488

File Name: bind9_996_S3_dnsco.nasl

Version: 1.7

Type: remote

Family: DNS

Published: 2/24/2015

Updated: 11/15/2018

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: cpe:/a:isc:dnsco_bind

Required KB Items: Settings/ParanoidReport, bind/version

Exploit Ease: No known exploits are available

Patch Publication Date: 2/18/2015

Vulnerability Publication Date: 2/18/2015

Reference Information

CVE: CVE-2015-1349

BID: 72673

Detections

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