Code injection in Unbound - CVE-2019-25031
Published: May 10, 2021
Vulnerability identifier: #VU53023
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2019-25031
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: NLnet Labs
Affected software:
Unbound
Unbound
Detailed vulnerability description
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.
How to mitigate CVE-2019-25031
Install updates from vendor's website.