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EulerOS 2.0 SP10 : unbound (EulerOS-SA-2022-2670)

medium Nessus Plugin ID 166839

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

 - 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 Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected unbound packages.

See Also

http://www.nessus.org/u?337654d2

Plugin Details

Severity: Medium

ID: 166839

File Name: EulerOS_SA-2022-2670.nasl

Version: 1.3

Type: local

Published: 11/2/2022

Updated: 11/28/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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

CPE: p-cpe:/a:huawei:euleros:python3-unbound, p-cpe:/a:huawei:euleros:unbound, p-cpe:/a:huawei:euleros:unbound-libs, cpe:/o:huawei:euleros:2.0

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Ease: No known exploits are available

Patch Publication Date: 11/2/2022

Vulnerability Publication Date: 8/1/2022

Reference Information

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