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Alpine: multiple unbound packages, py-unbound: security update to 1.16.2-r0

medium Tenable Self-Hosted Container Security Plugin ID 424629

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

 - 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)

See Also

https://security.alpinelinux.org/vuln/CVE-2022-30698

https://security.alpinelinux.org/vuln/CVE-2022-30699

Plugin Details

Severity: Medium

ID: 424629

Version: Revision 1.8

Type: Local

Published: 4/4/2025

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

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: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/1/2022

Reference Information

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