Unbound < 1.4.11 Cache Update Policy Deleted Domain Name Resolving Weakness

medium Nessus Plugin ID 87869
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Synopsis

The remote name server is affected by a ghost domain names vulnerability.

Description

According to its self-reported version number, the remote Unbound DNS resolver is affected by a ghost domain names vulnerability due to the resolver service overwriting cached name servers and TTL values in NS records while processing the response of an A record query. A remote attacker can exploit this to resume the resolving of revoked domain names.

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 Unbound version 1.4.11 or later.

See Also

https://nlnetlabs.nl/pipermail/unbound-users/2011-June/001917.html

https://www.internetsociety.org/sites/default/files/12_1.pdf

Plugin Details

Severity: Medium

ID: 87869

File Name: unbound_1_4_11.nasl

Version: 1.4

Type: remote

Family: DNS

Published: 1/12/2016

Updated: 11/20/2019

Dependencies: unbound_version.nasl

Configuration: Enable paranoid mode

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

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

Vulnerability Information

CPE: cpe:/a:unbound:unbound

Required KB Items: Settings/ParanoidReport, unbound/version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2011

Vulnerability Publication Date: 2/7/2012

Reference Information

CVE: CVE-2012-1192

BID: 78263