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NTP Bug 3361

0rigin DoS (Medium)

  • Date Resolved: 21 Mar 2017
  • References: Sec 3361 / CVE-2016-9042 / VU#325339
  • Affects: ntp-4.2.8p9 (21 Nov 2016), up to but not including ntp-4.2.8p10
  • CVSS2: MED 4.9 (AV:N/AC:H/Au:N/C:N/I:N/A:C) (worst case)
  • CVSS3: MED 4.4 CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H (worst case)
  • Summary: An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition. This vulnerability can only be exploited if the attacker can spoof all of the servers.
  • Mitigation:
  • Credit: This weakness was discovered by Matthew Van Gundy of Cisco.


This topic: Main > SecurityNotice > NtpBug3361
Topic revision: r1 - 2017-03-22 - 01:42:11 - HarlanStenn
 
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