FreeBSD : Unbound -- Multiple vulnerabilities (bc43a578-14ec-11ed-856e-d4c9ef517024)

medium Nessus Plugin ID 163892

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the bc43a578-14ec-11ed-856e-d4c9ef517024 advisory.

- NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the ghost domain names attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.
(CVE-2022-30698)

- NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the ghost domain names attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever- updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten. (CVE-2022-30699)

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

Solution

Update the affected packages.

See Also

https://www.nlnetlabs.nl/projects/unbound/security-advisories/

http://www.nessus.org/u?146dd999

Plugin Details

Severity: Medium

ID: 163892

File Name: freebsd_pkg_bc43a57814ec11ed856ed4c9ef517024.nasl

Version: 1.3

Type: local

Published: 8/6/2022

Updated: 8/9/2022

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS Score Source: CVE-2022-30699

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*, p-cpe:2.3:a:freebsd:freebsd:unbound:*:*:*:*:*:*:*

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/5/2022

Vulnerability Publication Date: 8/1/2022

Reference Information

CVE: CVE-2022-30698, CVE-2022-30699