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NTP Monlist Feature Enabled
Information
Severity
Severity
Medium
Family
Family
Denial of Service
CVSSv2 Base
CVSSv2 Base
5.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Solution Type
Solution Type
Vendor Patch
Created
Created
9 years ago
Modified
Modified
4 years ago
Summary
NTP is prone to a remote denial-of-service vulnerability because it fails to properly handle certain incoming network packets.
Insight
Insight
The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests, as exploited in the wild in December 2013.
Affected Software
Affected Software
NTP before 4.2.7p26
Detection Method
Detection Method
Send a NTP monlist request and check the response.
Solution
Solution
Update to NTP 4.2.7p26 or newer or set 'disable monitor' in ntp.conf.