Code injection in Unbound - CVE-2019-25031

Vulnerability identifier: #VU53023

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-25031

CWE-ID: CWE-74

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to improper input validation within the contrib/create_unbound_ad_servers.sh script, when retrieving data before writing them into a configuration file. A remote non-authenticated attacker with ability to perform MitM attack can intercept and change Unbound configuration, as the input is retrieved via unencrypted HTTP channel.

Unbound
cflinuxfs3
SUSE CaaS Platform
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Enterprise Storage
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Realtime Extension
SUSE Linux Enterprise Module for Basesystem
Ubuntu
unbound (Ubuntu package)
libunbound2 (Ubuntu package)
unbound-debuginfo
unbound-anchor-debuginfo
unbound-anchor
libunbound2-debuginfo
libunbound2
unbound-debugsource
unbound-devel
libunbound8 (Ubuntu package)

Install updates from vendor's website.

Unbound - update to 1.9.5
cflinuxfs3 - update to 0.237.0
unbound (Ubuntu package) - addressed in versions 1.6.7-1ubuntu2.4, 1.9.4-2ubuntu1.2
libunbound2 (Ubuntu package) - update to 1.6.7-1ubuntu2.4
unbound-debuginfo - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
unbound-anchor-debuginfo - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
unbound-anchor - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
libunbound2-debuginfo - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
libunbound2 - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
unbound-debugsource - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
unbound-devel - addressed in versions 1.6.8-3.9.1, 1.6.8-10.6.1
libunbound8 (Ubuntu package) - update to 1.9.4-2ubuntu1.2

• https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
• https://lists.debian.org/debian-lts-announce/2021/05/msg00007.html
• https://security.netapp.com/advisory/ntap-20210507-0007/

• Multiple vulnerabilities in Unbound DNS Server
• Cloud Foundry cflinuxfs3 update for Unboud
• Ubuntu update for unbound
• SUSE update for unbound
• SUSE update for unbound
• SUSE update for unbound