CentOS 8 : unbound (CESA-2021:1853)

critical Nessus Plugin ID 149745
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.


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


The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1853 advisory.

- unbound: integer overflow in the regional allocator via regional_alloc (CVE-2019-25032)

- unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write (CVE-2019-25034)

- unbound: out-of-bounds write in sldns_bget_token_par (CVE-2019-25035)

- unbound: assertion failure and denial of service in synth_cname (CVE-2019-25036)

- unbound: assertion failure and denial of service in dname_pkt_copy via an invalid packet (CVE-2019-25037)

- unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c (CVE-2019-25038)

- unbound: integer overflow in a size calculation in respip/respip.c (CVE-2019-25039)

- unbound: infinite loop via a compressed name in dname_pkt_copy (CVE-2019-25040)

- unbound: assertion failure via a compressed name in dname_pkt_copy (CVE-2019-25041)

- unbound: out-of-bounds write via a compressed name in rdata_copy (CVE-2019-25042)

- unbound: symbolic link traversal when writing PID file (CVE-2020-28935)

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


Update the affected packages.

See Also


Plugin Details

Severity: Critical

ID: 149745

File Name: centos8_RHSA-2021-1853.nasl

Version: 1.3

Type: local

Agent: unix

Published: 5/19/2021

Updated: 6/2/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2019-25042


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

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


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:centos:centos:8-stream, p-cpe:/a:centos:centos:python3-unbound, p-cpe:/a:centos:centos:unbound, p-cpe:/a:centos:centos:unbound-devel, p-cpe:/a:centos:centos:unbound-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/18/2021

Vulnerability Publication Date: 12/7/2020

Reference Information

CVE: CVE-2019-25032, CVE-2019-25034, CVE-2019-25035, CVE-2019-25036, CVE-2019-25037, CVE-2019-25038, CVE-2019-25039, CVE-2019-25040, CVE-2019-25041, CVE-2019-25042, CVE-2020-28935

RHSA: 2021:1853