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.
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
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsUnbound: 1.6.4 - 1.9.4
External linkshttp://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.