CVE-2017-6451 Explained : Impact and Mitigation

In versions of NTP prior to 4.2.8p10 and 4.3.x prior to 4.3.94, a vulnerability exists in the mx4200_send function of the legacy MX4200 refclock. This flaw allows local users to execute arbitrary code through unspecified vectors, resulting in an out-of-bounds memory write.

Understanding CVE-2017-6451

This CVE identifier pertains to a specific vulnerability found in NTP versions before 4.2.8p10 and 4.3.x before 4.3.94.

What is CVE-2017-6451?

The vulnerability in the mx4200_send function of the legacy MX4200 refclock arises due to improper handling of the snprintf function's return value. This flaw enables local users to trigger an out-of-bounds memory write by exploiting unspecified vectors.

The Impact of CVE-2017-6451

The exploitation of this vulnerability can lead to local users executing arbitrary code, potentially compromising the affected system's security and integrity.

Technical Details of CVE-2017-6451

This section delves into the technical aspects of the CVE.

Vulnerability Description

The mx4200_send function in the legacy MX4200 refclock in NTP versions before 4.2.8p10 and 4.3.x before 4.3.94 inadequately handles the return value of the snprintf function, allowing for the execution of arbitrary code via unspecified vectors, resulting in an out-of-bounds memory write.

Affected Systems and Versions

NTP versions prior to 4.2.8p10 and 4.3.x before 4.3.94

Exploitation Mechanism

Local users can exploit unspecified vectors to trigger an out-of-bounds memory write, enabling the execution of arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2017-6451 requires immediate action and long-term security practices.

Immediate Steps to Take

Update NTP to version 4.2.8p10 or 4.3.94 to mitigate the vulnerability.
Monitor for any signs of unauthorized access or malicious activities on the system.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement the principle of least privilege to restrict user access and minimize potential risks.

Patching and Updates

Apply patches and updates provided by NTP to ensure the security of the system.