CVE-2018-8956: Input Validation
First published: Wed May 06 2020(Updated: )
ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| NTP ntp | =4.2.8-p10 | |
| NTP ntp | =4.2.8-p11 | |
| NTP ntp | =4.2.8-p12 | |
| NTP ntp | =4.2.8-p13 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html
- http://www.ntp.org/
- https://arxiv.org/abs/2005.01783
- https://nikhiltripathi.in/NTP_attack.pdf
- https://security.netapp.com/advisory/ntap-20200518-0006/
- https://tools.ietf.org/html/rfc5905
Frequently Asked Questions
What is CVE-2018-8956?
CVE-2018-8956 is a vulnerability in ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12, and 4.2.8p13 that allows remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server.
What is the severity of CVE-2018-8956?
The severity of CVE-2018-8956 is medium (5.3).
How can an attacker exploit CVE-2018-8956?
An attacker can exploit CVE-2018-8956 by sending spoofed mode 3 and mode 5 packets to the target broadcast client, preventing it from synchronizing its clock with a broadcast NTP server.
Which versions of ntp are affected by CVE-2018-8956?
ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12, and 4.2.8p13 are affected by CVE-2018-8956.
Where can I find more information about CVE-2018-8956?
You can find more information about CVE-2018-8956 at the following references: [1] [2] [3]
- collector/nvd-index
- agent/weakness
- agent/references
- agent/severity
- agent/author
- agent/type
- agent/tags
- agent/event
- agent/description
- agent/first-publish-date
- agent/last-modified-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- vendor/ntp
- canonical/ntp ntp
- version/ntp ntp/4.2.8-p10
- version/ntp ntp/4.2.8-p11
- version/ntp ntp/4.2.8-p12
- version/ntp ntp/4.2.8-p13