CVE-2016-2516: Input Validation
Published Jan 30, 2017
·Updated
NTP before 4.2.8p7 and 4.3.x before 4.3.92, when mode7 is enabled, allows remote attackers to cause a denial of service (ntpd abort) by using the same IP address multiple times in an unconfig directive.
Affected Software
94 affected componentsFixes available
debian/ntp
1:4.2.8p12+dfsg-41:4.2.8p15+dfsg-1
NTP ntp<=4.2.8
NTP ntp=4.3.0
NTP ntp=4.3.1
NTP ntp=4.3.2
NTP ntp=4.3.3
NTP ntp=4.3.4
NTP ntp=4.3.5
NTP ntp=4.3.6
NTP ntp=4.3.7
NTP ntp=4.3.8
NTP ntp=4.3.9
NTP ntp=4.3.10
NTP ntp=4.3.11
NTP ntp=4.3.12
NTP ntp=4.3.13
NTP ntp=4.3.14
NTP ntp=4.3.15
NTP ntp=4.3.16
NTP ntp=4.3.17
NTP ntp=4.3.18
NTP ntp=4.3.19
NTP ntp=4.3.20
NTP ntp=4.3.21
NTP ntp=4.3.22
NTP ntp=4.3.23
NTP ntp=4.3.24
NTP ntp=4.3.25
NTP ntp=4.3.26
NTP ntp=4.3.27
NTP ntp=4.3.28
NTP ntp=4.3.29
NTP ntp=4.3.30
NTP ntp=4.3.31
NTP ntp=4.3.32
NTP ntp=4.3.33
NTP ntp=4.3.34
NTP ntp=4.3.35
NTP ntp=4.3.36
NTP ntp=4.3.37
NTP ntp=4.3.38
NTP ntp=4.3.39
NTP ntp=4.3.40
NTP ntp=4.3.41
NTP ntp=4.3.42
NTP ntp=4.3.43
NTP ntp=4.3.44
NTP ntp=4.3.45
NTP ntp=4.3.46
NTP ntp=4.3.47
NTP ntp=4.3.48
NTP ntp=4.3.49
NTP ntp=4.3.50
NTP ntp=4.3.51
NTP ntp=4.3.52
NTP ntp=4.3.53
NTP ntp=4.3.54
NTP ntp=4.3.55
NTP ntp=4.3.56
NTP ntp=4.3.57
NTP ntp=4.3.58
NTP ntp=4.3.59
NTP ntp=4.3.60
NTP ntp=4.3.61
NTP ntp=4.3.62
NTP ntp=4.3.63
NTP ntp=4.3.64
NTP ntp=4.3.65
NTP ntp=4.3.66
NTP ntp=4.3.67
NTP ntp=4.3.68
NTP ntp=4.3.69
NTP ntp=4.3.70
NTP ntp=4.3.71
NTP ntp=4.3.72
NTP ntp=4.3.73
NTP ntp=4.3.74
NTP ntp=4.3.75
NTP ntp=4.3.76
NTP ntp=4.3.77
NTP ntp=4.3.78
NTP ntp=4.3.79
NTP ntp=4.3.80
NTP ntp=4.3.81
NTP ntp=4.3.82
NTP ntp=4.3.83
NTP ntp=4.3.84
NTP ntp=4.3.85
NTP ntp=4.3.86
NTP ntp=4.3.87
NTP ntp=4.3.88
NTP ntp=4.3.89
NTP ntp=4.3.90
NTP ntp=4.3.91
Event History
Jan 30, 2017
CVE Published
via MITRE·09:00 PM
Data Sourced
via MITRE·09:00 PM
Description
Data Sourced
via NVD·09:59 PM
DescriptionSeverityWeaknessAffected Software
Dec 11, 58332
Event
04:56 PM
Frequently Asked Questions
1
What is the severity of CVE-2016-2516?
CVE-2016-2516 has a severity rating that indicates medium risk due to its potential to cause denial of service.
2
How do I fix CVE-2016-2516?
To fix CVE-2016-2516, you need to upgrade your NTP software to version 4.2.8p12+dfsg-4 or later.
3
What versions of NTP are affected by CVE-2016-2516?
NTP versions before 4.2.8p7 and all versions from 4.3.0 to 4.3.91 are affected by CVE-2016-2516.
4
What type of attack does CVE-2016-2516 allow?
CVE-2016-2516 allows remote attackers to cause a denial of service by making specific requests to the NTP server.
5
How can I mitigate the risks of CVE-2016-2516?
Mitigation for CVE-2016-2516 involves disabling mode7 in your NTP configuration if you cannot immediately upgrade the software.