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Cisco Bug: CSCur38341 - NTP Attacks Using CVE-2013-5211

Last Modified

Aug 11, 2015

Products (1)

  • Cisco Unified MeetingPlace

Known Affected Releases

8.5 8.6(1.2)

Description (partial)

A vulnerability in Network Time Protocol (NTP) package of Cisco Finesse Software could allow an unauthenticated, remote attacker to cause a
Denial of Service (DoS) condition on an affected device.

The vulnerability is due to processing of MODE_PRIVATE (Mode 7) NTP control messages which have a large amplification vector. An attacker could
exploit this vulnerability by sending Mode 7 control requests to NTP servers and observing responses amplified up to 5500 times in size. An
exploit could allow the attacker to cause a Denial of Service (DoS) condition where the affected NTP server is forced to process and respond with
large response data.

All versions of ntpd prior to 4.2.7 are vulnerable by default.
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