Incorrect calcualtion in ntp - CVE-2016-7433

Vulnerability identifier: #VU12304

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2016-7433

CWE-ID: CWE-682

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to improper performance of the initial sync calculations. A remote attacker can cause the service to crash via unknown vectors, related to a "root distance that did not include the peer dispersion."

ntp
Amazon Linux AMI
Arch Linux
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux EUS Compute Node
Fedora
SIMATIC NET CP 443-1 OPC UA
ntp

Update to version 4.2.8p9.

ntp - addressed in versions 4.2.6p5-43.fc23, 4.2.6p5-43.fc24, 4.2.6p5-43.fc25

• https://www.nwtime.org/ntp428p9_release/

• Amazon Linux AMI update for ntp
• Red Hat update for ntp
• Arch Linux update for ntp
• Multiple vulnerabilities in Siemens SIMATIC NET CP 443-1 OPC UA
• Fedora 24 update for ntp
• Fedora 25 update for ntp
• Fedora 23 update for ntp