CVE-2018-17154 : Exploit Details and Defense Strategies

A vulnerability in FreeBSD versions before 11.2-STABLE(r338987), 11.2-RELEASE-p4, and 11.1-RELEASE-p15 can lead to a denial of service due to inadequate memory checking in a system call.

Understanding CVE-2018-17154

This CVE identifies a vulnerability in FreeBSD versions that can be exploited by authenticated local users to cause a denial of service.

What is CVE-2018-17154?

The vulnerability arises from insufficient memory checking in the freebsd4_getfsstat system call, resulting in a NULL pointer dereference. This flaw allows attackers with local user privileges to trigger a denial of service.

The Impact of CVE-2018-17154

The vulnerability enables authenticated attackers to exploit the system call issue, potentially leading to a denial of service.

Technical Details of CVE-2018-17154

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability in FreeBSD versions before 11.2-STABLE(r338987), 11.2-RELEASE-p4, and 11.1-RELEASE-p15 stems from inadequate memory checking in the freebsd4_getfsstat system call, allowing for a NULL pointer dereference.

Affected Systems and Versions

Affected Product: FreeBSD
Affected Versions: 11.2 before 11.2-RELEASE-p4, 11.1 before 11.1-RELEASE-p15

Exploitation Mechanism

Attackers with local user privileges and authentication can exploit this vulnerability to trigger a denial of service by leveraging the inadequate memory checking in the system call.

Mitigation and Prevention

Protecting systems from CVE-2018-17154 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by FreeBSD to address the vulnerability.
Monitor security advisories for updates and apply them promptly.

Long-Term Security Practices

Regularly update and patch FreeBSD systems to mitigate potential vulnerabilities.
Implement the principle of least privilege to restrict user access and minimize the impact of potential exploits.
Conduct regular security assessments and audits to identify and address security weaknesses.
Educate users on secure practices to prevent unauthorized access and exploitation.
Consider implementing additional security measures such as intrusion detection systems and access controls.

Patching and Updates

Stay informed about security updates and patches released by FreeBSD.
Apply patches promptly to ensure systems are protected against known vulnerabilities.