#VU39823 Resource exhaustion in ntp - CVE-2016-7428

Vulnerability identifier: #VU39823

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-7428

CWE-ID: CWE-400

Exploitation vector: Local 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 perform service disruption.

ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via the poll interval in a broadcast packet.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ntp: 4.2.8

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External links
https://nwtime.org/ntp428p9_release/
https://support.ntp.org/bin/view/Main/NtpBug3113
https://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
https://www.securityfocus.com/bid/94446
https://www.securitytracker.com/id/1037354
https://bto.bluecoat.com/security-advisory/sa139
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us
https://usn.ubuntu.com/3707-2/
https://www.kb.cert.org/vuls/id/633847

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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