CVE-2017-18284 : Exploit Details and Defense Strategies

CVE-2017-18284, published on June 4, 2018, addresses a vulnerability in the Gentoo app-backup/burp package. The issue allows local users to potentially terminate processes by manipulating the PID file ownership.

Understanding CVE-2017-18284

This CVE entry highlights a security flaw in the Gentoo app-backup/burp package that existed before version 2.1.32.

What is CVE-2017-18284?

Prior to version 2.1.32, the Gentoo app-backup/burp package assigns ownership of the directory containing the PID file to the burp account. This could potentially enable local users to terminate any process by exploiting their access to this account for modifying the PID file prior to the execution of a privileged script that sends a SIGKILL signal.

The Impact of CVE-2017-18284

The vulnerability could allow local users to kill arbitrary processes by leveraging access to the burp account for PID file modification before a root script sends a SIGKILL signal.

Technical Details of CVE-2017-18284

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

Vulnerability Description

The Gentoo app-backup/burp package before version 2.1.32 sets the ownership of the PID file directory to the burp account, potentially enabling local users to kill arbitrary processes.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

Local users can exploit their access to the burp account to modify the PID file before a root script executes, allowing them to terminate processes.

Mitigation and Prevention

Protecting systems from CVE-2017-18284 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Upgrade to version 2.1.32 or later of the Gentoo app-backup/burp package.
Monitor and restrict access to the burp account.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Regularly review and update file permissions and ownership.

Patching and Updates

Ensure timely patching and updates for the Gentoo app-backup/burp package to mitigate the vulnerability.