CVE-2019-3461 Explained : Impact and Mitigation

CVE-2019-3461 pertains to a race condition in Debian tmpreaper version 1.6.13+nmu1 that can lead to local privilege escalation through a mount operation using rename(). This vulnerability allows for potential file relocation within the filesystem hierarchy.

Understanding CVE-2019-3461

This CVE involves a race condition in tmpreaper that can be exploited for local privilege escalation.

What is CVE-2019-3461?

The vulnerability in Debian tmpreaper version 1.6.13+nmu1 arises during a mount operation using rename(), potentially allowing an attacker to escalate privileges locally.

The Impact of CVE-2019-3461

The vulnerability enables an attacker to relocate files within the filesystem hierarchy, posing a risk of unauthorized access and manipulation of critical system files.

Technical Details of CVE-2019-3461

CVE-2019-3461 involves a race condition in tmpreaper version 1.6.13+nmu1.

Vulnerability Description

The vulnerability allows for local privilege escalation by exploiting a race condition during a mount operation using rename().

Affected Systems and Versions

Product: tmpreaper
Vendor: Debian GNU/Linux
Affected Version: 1.6.13+nmu1

Exploitation Mechanism

By utilizing rename() for mounting, an attacker can potentially relocate files to different locations within the filesystem hierarchy, such as /etc/cron.d/.

Mitigation and Prevention

To address CVE-2019-3461, follow these steps:

Immediate Steps to Take

Update tmpreaper to fixed versions 1.6.13+nmu1+deb9u1 or 1.6.14.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

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

Patching and Updates

Apply security patches promptly to mitigate known vulnerabilities and enhance system security.