SUSE SLES11 Security Update : bind (SUSE-SU-2020:14400-1)

medium Nessus Plugin ID 150635
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote SUSE host is missing one or more security updates.

Description

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14400-1 advisory.

- To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a zone, BIND 9 provides a feature called update-policy. Various rules can be configured to limit the types of updates that can be performed by a client, depending on the key used when sending the update request.
Unfortunately, some rule types were not initially documented, and when documentation for them was added to the Administrator Reference Manual (ARM) in change #3112, the language that was added to the ARM at that time incorrectly described the behavior of two rule types, krb5-subdomain and ms-subdomain. This incorrect documentation could mislead operators into believing that policies they had configured were more restrictive than they actually were. This affects BIND versions prior to BIND 9.11.5 and BIND 9.12.3.
(CVE-2018-5741)

- A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor. (CVE-2020-8616)

- Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results. (CVE-2020-8617)

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

Solution

Update the affected packages.

See Also

https://bugzilla.suse.com/1033843

https://bugzilla.suse.com/1092283

https://bugzilla.suse.com/1109160

https://bugzilla.suse.com/1171740

https://bugzilla.suse.com/1172220

https://bugzilla.suse.com/1172680

http://www.nessus.org/u?d22f7404

https://www.suse.com/security/cve/CVE-2018-5741

https://www.suse.com/security/cve/CVE-2020-8616

https://www.suse.com/security/cve/CVE-2020-8617

Plugin Details

Severity: Medium

ID: 150635

File Name: suse_SU-2020-14400-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 6/10/2021

Updated: 1/21/2022

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2018-5741

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.1

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

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

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:bind, p-cpe:/a:novell:suse_linux:bind-chrootenv, p-cpe:/a:novell:suse_linux:bind-doc, p-cpe:/a:novell:suse_linux:bind-libs, p-cpe:/a:novell:suse_linux:bind-libs-32bit, p-cpe:/a:novell:suse_linux:bind-utils, cpe:/o:novell:suse_linux:11

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/19/2020

Vulnerability Publication Date: 9/19/2018

Reference Information

CVE: CVE-2018-5741, CVE-2020-8616, CVE-2020-8617

SuSE: SUSE-SU-2020:14400-1

IAVA: 2018-A-0303-S, 2020-A-0217-S