SB2020072709 - Gentoo update for NTP

Description

This security bulletin contains information about 3 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.

3) Memory leak (CVE-ID: CVE-2020-15025)

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak when processing CMAC authentication. A remote attacker can force the application to leak memory and perform denial of service attack.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/
• https://security.gentoo.org/glsa/202007-12