FreeBSD : bind9 -- Denial of Service in named(8) (ef3306fc-8f9b-11db-ab33-000e0c2e438a)

medium Nessus Plugin ID 23953

Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Problem Description For a recursive DNS server, a remote attacker sending enough recursive queries for the replies to arrive after all the interested clients have left the recursion queue will trigger an INSIST failure in the named(8) daemon. Also for a recursive DNS server, an assertion failure can occur when processing a query whose reply will contain more than one SIG(covered) RRset.

For an authoritative DNS server serving a RFC 2535 DNSSEC zone which is queried for the SIG records where there are multiple SIG(covered) RRsets (e.g. a zone apex), named(8) will trigger an assertion failure when it tries to construct the response. Impact An attacker who can perform recursive lookups on a DNS server and is able to send a sufficiently large number of recursive queries, or is able to get the DNS server to return more than one SIG(covered) RRsets can stop the functionality of the DNS service.

An attacker querying an authoritative DNS server serving a RFC 2535 DNSSEC zone may be able to crash the DNS server. Workaround A possible workaround is to only allow trusted clients to perform recursive queries.

Solution

Update the affected package.

Plugin Details

Severity: Medium

ID: 23953

File Name: freebsd_pkg_ef3306fc8f9b11dbab33000e0c2e438a.nasl

Version: 1.18

Type: local

Family: FreeBSD Local Security Checks

Published: 12/30/2006

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:bind9, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 12/19/2006

Vulnerability Publication Date: 9/6/2006

Reference Information

CVE: CVE-2006-4095, CVE-2006-4096

BID: 19859

FreeBSD: SA-06:20.bind

Detections

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