PT-2019-6140 · Nlnet+8 · Unbound+8

Published 2019-12-11 · Updated 2024-08-05 · CVE-2019-25036

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Unbound versions prior to 1.9.5

Description The issue is related to the synth cname() function in the Unbound DNS server, which may lead to an assertion failure and denial of service. However, the vendor disputes that this is a vulnerability, stating that although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited.

Recommendations For Unbound versions prior to 1.9.5, update to version 1.9.5 or later to resolve the issue. As a temporary workaround, consider restricting access to the synth cname() function until a patch is available.

Fix

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

ALT-PU-2019-3282

ALT-PU-2019-3287

BDU:2021-06226

CESA-2021_1853

CVE-2019-25036

DLA-2652-1

OPENSUSE-SU-2022:0176-1

OPENSUSE-SU-2022_0176-1

RHSA-2021:1853

RHSA-2021_1853

RHSA-2022:0632

RLSA-2021:1853

SUSE-SU-2022:0176-1

SUSE-SU-2022:0176-2

SUSE-SU-2022:0301-1

USN-4938-1

Affected Products

Alt Linux

Astra Linux

Centos

Linuxmint

Red Hat

Rocky Linux

Suse

Ubuntu

Unbound

References · 147

• https://errata.rockylinux.org/RLSA-2021:1853 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-25035 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0301-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05865 · Security Note
• https://osv.dev/vulnerability/RLSA-2021:1853 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-25040 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-25033 · Security Note
• https://errata.altlinux.org/ALT-PU-2019-3287 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06245 · Security Note
• https://ubuntu.com/security/notices/USN-4938-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18934 · Security Note
• https://osv.dev/vulnerability/CVE-2019-25036 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-25037 · Security Note
• https://bdu.fstec.ru/vul/2022-06885 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-25040 · Security Note