SB2020031931 - Multiple vulnerabilities in ntpd

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Main Vulnerability Database SB2020031931

SB2020031931 - Multiple vulnerabilities in ntpd

Published: March 19, 2020 Updated: July 7, 2020

Security Bulletin ID SB2020031931
Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 secuirty vulnerabilities.


1) Out-of-bounds read (CVE-ID: N/A)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in ntp daemon with enabled ntpdc (mode 7). A remote attacker can send short packets to the affected ntp daemon and perform a denial of service attack against the ntp server.


2) Resource management error (CVE-ID: CVE-2020-13817)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to ntpd uses highly predictable timestamps that can allow spoofing attack over IPv4 or a denial of service attack. A remote non-authenticated attacker can modify clock on the client NTP server to terminate it.


3) Resource management error (CVE-ID: N/A)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to unspecified error in ntp client. A remote attacker can perform a denial of service attack against an unauthenticated client.


4) Input validation error (CVE-ID: CVE-2018-8956)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing NTP packets. A remote attacker that controls a slave server or is part of the same broadcast can prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets.



Remediation

Install update from vendor's website.

References