CVE-2018-7184 : Exploit Details and Defense Strategies

In ntp version 4.2.8p4 prior to 4.2.8p11, a vulnerability exists where remote attackers can disrupt systems by sending packets with zero-origin timestamps, causing an association reset. This issue is a result of an incomplete fix for a previous CVE.

Understanding CVE-2018-7184

This CVE involves a vulnerability in the Network Time Protocol (NTP) that allows attackers to cause disruptions by manipulating packet timestamps.

What is CVE-2018-7184?

In ntp version 4.2.8p4 before 4.2.8p11, the vulnerability arises from the mishandling of packet timestamps, enabling attackers to reset associations and disrupt systems.

The Impact of CVE-2018-7184

The vulnerability allows remote attackers to trigger denial of service (DoS) attacks by sending specially crafted packets with zero-origin timestamps, leading to system disruptions.

Technical Details of CVE-2018-7184

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The issue in ntpd drops invalid packets before updating the "received" timestamp, allowing attackers to reset associations and disrupt systems by sending packets with zero-origin timestamps.

Affected Systems and Versions

Affected Version: ntp 4.2.8p4 to 4.2.8p11
Systems running these versions of NTP are vulnerable to exploitation.

Exploitation Mechanism

Attackers exploit the vulnerability by sending packets with zero-origin timestamps, causing the association to reset and disrupting the system.

Mitigation and Prevention

Protecting systems from CVE-2018-7184 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update NTP to version 4.2.8p11 or newer to mitigate the vulnerability.
Monitor network traffic for any suspicious activity that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch NTP software to address known vulnerabilities.
Implement network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Stay informed about security advisories and patches released by NTP and relevant vendors.
Apply patches promptly to ensure systems are protected against known vulnerabilities.