OS Command Injection in Unbound - CVE-2019-18934

Vulnerability identifier: #VU29236

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-18934

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Unbound
unbound (Alpine package)
unbound (Red Hat package)
unbound
unbound-libs
unbound-devel
unbound-help
python3-unbound
unbound-debugsource
unbound-debuginfo
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Opensuse
openEuler
Fedora

Install updates from vendor's website.

Unbound - update to 1.9.5
unbound (Alpine package) - update to 1.7.3-r2
unbound (Red Hat package) - update to 1.7.3-10.el8
unbound - addressed in versions 1.9.6-1.fc30, 1.9.6-1.fc31
unbound - update to 1.11.0-2
unbound-libs - update to 1.11.0-2
unbound-devel - update to 1.11.0-2
unbound-help - update to 1.11.0-2
python3-unbound - update to 1.11.0-2
unbound-debugsource - update to 1.11.0-2
unbound-debuginfo - update to 1.11.0-2

• 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/

• Remote command execution in Unbound
• OpenSUSE Linux update for unbound
• OpenSUSE Linux update for unbound
• OS Command Injection in unbound (Alpine package)
• Red Hat Enterprise Linux 8 update for unbound
• openEuler 20.03 LTS update for unbound
• Fedora 30 update for unbound
• Fedora 31 update for unbound