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In March, 2020, NTP.org[1] released a security advisory detailing a number of security issues. The following vulnerability reported in the NTP advisory is addressed in this document.
| Item | Score | |||
| # | Vulnerability ID | Source | Score | Summary |
| 1 | CVE-2020-11868 | CVSS 3.0 | 7.5 High | ntp: DoS on client ntpd using server mode packet [2] |
The table below indicates releases of ACOS exposed to these vulnerabilities and ACOS releases that address these issues or are otherwise unaffected by them.
Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.
| Releases Affected | Releases Resolved or Unaffected |
|---|---|
| 5.2.0 | 5.2.0-P1 |
| 5.0.0 – 5.1.0-P4 | 5.1.0-P5 |
| 4.1.4 – 4.1.4-GR1-P4 | 4.1.4-GR1-P5 |
| 4.1.2 – 4.1.2-P1 | 4.1.4-GR1-P5 |
| 4.1.1 – 4.1.1-P13 | 4.1.4-GR1-P5 |
| 4.1.100 – 4.1.100-P7 | None |
| 4.1.0 – 4.1.0-P13 | 4.1.4-GR1-P5 |
| 3.1.0-P1 – 3.2.5-P1 | 3.2.5-P2, 5.0.1-TPS |
| 2.8.2 – 2.8.2-P10 | 4.1.4-GR1-P5 |
| 2.7.2 – 2.7.2-P16 | 4.1.4-GR1-P5 |
Common security best practices in the industry for network appliance management and control planes can enhance protection against remote malicious attacks. Limit the exploitable attack surface for critical, infrastructure, networking equipment through the use of access lists or firewall filters to and from only trusted, administrative networks or hosts.
Ensure that the following are included for NTP configuration for ACOS devices:
Software updates that address these vulnerabilities are or will be published at the following URL:
http://www.a10networks.com/support/axseries/software-downloads
The following table shares brief descriptions of the vulnerabilities addressed in this document.
| Vulnerability ID | Vulnerability Description |
|---|---|
| CVE-2020-11868 |
ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp. |
| Ref # | General Link |
|---|---|
| [1] | March 2020 ntp-4.2.8p14 NTP Release and Security Vulnerability Announcement |
| [2] | NIST NVD CVE-2020-11868 |
None
| Revision | Date | Description |
|---|---|---|
| 1.0 | July 27, 2020 |
Initial Publication |
| 2.0 | August 16, 2021 |
x Add resolved releases for 3.2.5 |
© Copyright 2020 A10 Networks, Inc. All Rights Reserved.
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