CVE-2018-7184 — ntpd in ntp 4

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the cont

01What is this vulnerability?

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2018-03-06T20:00:00.000Z
• Last modified: 2024-08-05T06:24:11.248Z

09References

• packetstormsecurity.com — http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Upda…
• www.securityfocus.com — http://www.securityfocus.com/bid/103192
• security.gentoo.org — https://security.gentoo.org/glsa/201805-12
• security.FreeBSD.org — https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc
• security.netapp.com — https://security.netapp.com/advisory/ntap-20180626-0001/
• www.securityfocus.com — http://www.securityfocus.com/archive/1/541824/100/0/threaded
• support.ntp.org — http://support.ntp.org/bin/view/Main/NtpBug3453
• usn.ubuntu.com — https://usn.ubuntu.com/3707-1/
• www.synology.com — https://www.synology.com/support/security/Synology_SA_18_13
• support.hpe.com — https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpe…