PT-2016-6187 · Ntp+5 · Ntpd+7
Jakub Prokes
·
Published
2016-06-03
·
Updated
2024-06-15
·
CVE-2016-4954
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
NTP versions 4.x before 4.2.8p8
Description
The issue allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication. This is related to the
process packet function in ntp proto.c in ntpd. Multiple Cisco products that incorporate a version of the Network Time Protocol daemon (ntpd) package are also affected, potentially allowing an unauthenticated, remote attacker to cause a denial of service (DoS) condition or modify the time being advertised by a device acting as a Network Time Protocol (NTP) server.Recommendations
For NTP versions 4.x before 4.2.8p8, update to version 4.2.8p8 or later to resolve the issue.
As a temporary workaround, consider restricting access to the
process packet function in ntp proto.c until a patch is available.
For Cisco products, apply the software updates that address these vulnerabilities when they become available.
Workarounds that address one or more of these vulnerabilities may be available and will be documented in the Cisco bug for each affected product.Fix
DoS
Race Condition
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Cisco Ios
Cisco Ios Xr
Cisco Nexus
Freebsd
Suse
Ubuntu
Ntpd