Vulnerability identifier: #VU36001

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11331

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ntp
Server applications / Other server solutions

Vendor: ntp.org

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ntp: All versions

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External links
http://www.securityfocus.com/bid/108010
http://support.f5.com/csp/article/K09940637
http://support.f5.com/csp/article/K09940637?utm_source=f5support&utm_medium=RSS
http://tools.ietf.org/html/draft-gont-ntp-port-randomization-00

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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