CVE-2016-1547: Input Validation
First published: Thu Apr 28 2016(Updated: )
An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.
Credit: cret@cert.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/ntp | 1:4.2.8p12+dfsg-4 1:4.2.8p15+dfsg-1 | |
| redhat/ntp | <4.2.8 | 4.2.8 |
| Siemens TIM 4R-IE | ||
| Siemens TIM 4R-IE DNP3 | ||
| Siemens Simatic Net CP 443-1 OPC UA Firmware | ||
| NTP | <=4.2.8 | |
| <=4.2.8 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security
- https://security-tracker.debian.org/tracker/CVE-2016-1547
- http://rhn.redhat.com/errata/RHSA-2016-1552.html
- http://www.debian.org/security/2016/dsa-3629
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.securityfocus.com/bid/88276
- http://www.securitytracker.com/id/1035705
- http://www.talosintelligence.com/reports/TALOS-2016-0081/
- https://access.redhat.com/errata/RHSA-2016:1141
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
- https://security.gentoo.org/glsa/201607-15
- https://security.netapp.com/advisory/ntap-20171004-0002/
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
- https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19
- http://support.ntp.org/bin/view/Main/NtpBug3007
- http://www.talosintel.com/reports/TALOS-2016-0081/
- https://access.redhat.com/security/cve/CVE-2015-7979
- https://rhn.redhat.com/errata/RHSA-2016-1552.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1331461
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-159-11 (Advisory)
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-103-11 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2016-1547?
CVE-2016-1547 is rated as a medium severity vulnerability due to its potential for unauthorized association demobilization.
How do I fix CVE-2016-1547?
To mitigate CVE-2016-1547, upgrade NTP to version 4.2.8p12+dfsg-4 or later for Debian, or 4.2.8 version or later for Red Hat.
Which software versions are affected by CVE-2016-1547?
CVE-2016-1547 affects NTP versions up to and including 4.2.8p4, as well as various Siemens products that utilize vulnerable NTP versions.
Can CVE-2016-1547 be exploited remotely?
Yes, CVE-2016-1547 allows an off-path attacker to send spoofed packets to exploit the vulnerability.
What types of systems are impacted by CVE-2016-1547?
CVE-2016-1547 impacts systems running NTP versions prior to 4.2.8p12 and related Siemens products.
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/author
- agent/weakness
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2016-1547
- agent/software-canonical-lookup
- agent/description
- agent/severity
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/last-modified-date
- agent/event
- agent/trending
- agent/source
- collector/ics-cert-advisory
- source/ICS
- agent/software-canonical-lookup-request
- collector/nvd-index
- agent/softwarecombine
- agent/tags
- collector/nvd-api
- source/NVD
- package-manager/debian
- package-manager/redhat
- vendor/siemens
- canonical/siemens tim 4r-ie
- canonical/siemens tim 4r-ie dnp3
- canonical/siemens simatic net cp 443-1 opc ua firmware
- vendor/ntp
- canonical/ntp
- version/ntp/4.2.8