SB2019111923 - Remote command execution in Unbound
Published: November 19, 2019 Updated: June 25, 2020
Security Bulletin ID
SB2019111923
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) OS Command Injection (CVE-ID: CVE-2019-18934)
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to insufficient validation of user-supplied input in the ipsec module. A remote attacker can pass specially crafted input to the application and execute arbitrary commands on the system.Successful exploitation of he vulnerability requires that unbound is compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.
Remediation
Install update from vendor's website.
References
- http://www.openwall.com/lists/oss-security/2019/11/19/1
- https://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/Changelog
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt
- https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/