SB2020062326 - Red Hat Enterprise Linux 7 update for ntp

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Main Vulnerability Database SB2020062326

SB2020062326 - Red Hat Enterprise Linux 7 update for ntp

Published: June 23, 2020

Security Bulletin ID SB2020062326
Severity
Low
Patch available
YES
Number of vulnerabilities 2
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 2 secuirty vulnerabilities.


1) Authentication Bypass by Spoofing (CVE-ID: CVE-2020-11868)

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

The vulnerability exists due to ntpd 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.A remote attacker can bypass authentication and block synchronization.


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.


Remediation

Install update from vendor's website.

References