Remote command execution in Unbound



Published: 2019-11-19 | Updated: 2020-06-25
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-18934
CWE-ID CWE-78
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
Unbound
Server applications / DNS servers

Vendor NLnet Labs

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) OS Command Injection

EUVDB-ID: #VU29236

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18934

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Unbound: 1.6.4 - 1.9.4

External links

http://www.openwall.com/lists/oss-security/2019/11/19/1
http://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/Changelog
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/
http://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt
http://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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