7.1 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
0.018 Low
EPSS
Percentile
88.2%
Issue Overview:
It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548)
An out-of-bounds access flaw was found in the way ntpd processed certain packets. An authenticated attacker could use a crafted packet to create a peer association with hmode of 7 and larger, which could potentially (although highly unlikely) cause ntpd to crash. (CVE-2016-2518)
A flaw was found in the way libntp performed message authentication. An attacker able to observe the timing of the comparison function used in packet authentication could potentially use this flaw to recover the message digest. (CVE-2016-1550)
Assertion failure in ntpd on duplicate IPs on unconfig directives (CVE-2016-2516)
Affected Packages:
ntp
Issue Correction:
Run yum update ntp to update your system.
New Packages:
i686:
ntp-debuginfo-4.2.6p5-40.30.amzn1.i686
ntpdate-4.2.6p5-40.30.amzn1.i686
ntp-4.2.6p5-40.30.amzn1.i686
noarch:
ntp-doc-4.2.6p5-40.30.amzn1.noarch
ntp-perl-4.2.6p5-40.30.amzn1.noarch
src:
ntp-4.2.6p5-40.30.amzn1.src
x86_64:
ntp-debuginfo-4.2.6p5-40.30.amzn1.x86_64
ntp-4.2.6p5-40.30.amzn1.x86_64
ntpdate-4.2.6p5-40.30.amzn1.x86_64
Red Hat: CVE-2016-1548, CVE-2016-1550, CVE-2016-2516, CVE-2016-2518
Mitre: CVE-2016-1548, CVE-2016-1550, CVE-2016-2516, CVE-2016-2518
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 1 | i686 | ntp-debuginfo | < 4.2.6p5-40.30.amzn1 | ntp-debuginfo-4.2.6p5-40.30.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | ntpdate | < 4.2.6p5-40.30.amzn1 | ntpdate-4.2.6p5-40.30.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | ntp | < 4.2.6p5-40.30.amzn1 | ntp-4.2.6p5-40.30.amzn1.i686.rpm |
Amazon Linux | 1 | noarch | ntp-doc | < 4.2.6p5-40.30.amzn1 | ntp-doc-4.2.6p5-40.30.amzn1.noarch.rpm |
Amazon Linux | 1 | noarch | ntp-perl | < 4.2.6p5-40.30.amzn1 | ntp-perl-4.2.6p5-40.30.amzn1.noarch.rpm |
Amazon Linux | 1 | x86_64 | ntp-debuginfo | < 4.2.6p5-40.30.amzn1 | ntp-debuginfo-4.2.6p5-40.30.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | ntp | < 4.2.6p5-40.30.amzn1 | ntp-4.2.6p5-40.30.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | ntpdate | < 4.2.6p5-40.30.amzn1 | ntpdate-4.2.6p5-40.30.amzn1.x86_64.rpm |
7.1 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
0.018 Low
EPSS
Percentile
88.2%