CVE-2016-4957: Null Pointer Dereference
First published: Tue Jul 05 2016(Updated: )
ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet. NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| NTP | =4.2.8-p7 | |
| NTP | =4.3.92 | |
| Oracle Solaris and Zettabyte File System (ZFS) | =10 | |
| Oracle Solaris and Zettabyte File System (ZFS) | =11.3 | |
| SUSE Manager Proxy | =2.1 | |
| openSUSE OpenStack Cloud | =5 | |
| SUSE Manager | =2.1 | |
| SUSE Linux | =42.1 | |
| openSUSE | =13.2 | |
| SUSE Linux Enterprise Desktop | =12-sp1 | |
| SUSE Linux Enterprise Server | =11-sp2 | |
| SUSE Linux Enterprise Server | =11-sp3 | |
| SUSE Linux Enterprise Server | =11-sp4 | |
| SUSE Linux Enterprise Server | =12-sp1 |
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Reference Links
- http://bugs.ntp.org/3046
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
- http://support.ntp.org/bin/view/Main/NtpBug3046
- http://support.ntp.org/bin/view/Main/SecurityNotice
- http://www.kb.cert.org/vuls/id/321640
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.securitytracker.com/id/1036037
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc
- https://security.gentoo.org/glsa/201607-15
Frequently Asked Questions
What is the severity of CVE-2016-4957?
CVE-2016-4957 is classified as a high severity vulnerability due to its potential to cause a denial of service.
How do I fix CVE-2016-4957?
To fix CVE-2016-4957, you should upgrade to NTP version 4.2.8p8 or later, or apply relevant patches provided by your vendor.
What types of systems are affected by CVE-2016-4957?
CVE-2016-4957 affects various systems that utilize NTP versions prior to 4.2.8p8, including several versions of Oracle Solaris and openSUSE.
What is the impact of exploiting CVE-2016-4957?
Exploiting CVE-2016-4957 allows remote attackers to crash the NTP daemon, leading to denial of service.
Was CVE-2016-4957 caused by a fix for another vulnerability?
Yes, CVE-2016-4957 exists due to an incorrect fix for CVE-2016-1547.
- agent/type
- agent/references
- agent/severity
- agent/weakness
- agent/author
- agent/remedy
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/first-publish-date
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/ntp
- canonical/ntp
- version/ntp/4.2.8-p7
- version/ntp/4.3.92
- vendor/oracle
- canonical/oracle solaris and zettabyte file system (zfs)
- version/oracle solaris and zettabyte file system (zfs)/10
- version/oracle solaris and zettabyte file system (zfs)/11.3
- vendor/suse
- canonical/suse manager proxy
- version/suse manager proxy/2.1
- canonical/opensuse openstack cloud
- version/opensuse openstack cloud/5
- vendor/novell
- canonical/suse manager
- version/suse manager/2.1
- vendor/opensuse
- canonical/suse linux
- version/suse linux/42.1
- canonical/opensuse
- version/opensuse/13.2
- canonical/suse linux enterprise desktop
- version/suse linux enterprise desktop/12-sp1
- canonical/suse linux enterprise server
- version/suse linux enterprise server/11-sp2
- version/suse linux enterprise server/11-sp3
- version/suse linux enterprise server/11-sp4
- version/suse linux enterprise server/12-sp1