CVE-2019-13272 : Vulnerability Insights and Analysis

The Linux kernel prior to version 5.1.17 has a vulnerability in the ptrace_link function that can allow local users to gain root privileges by exploiting specific scenarios involving a parent-child process relationship.

Understanding CVE-2019-13272

This CVE pertains to a flaw in the Linux kernel that can lead to privilege escalation for local users.

What is CVE-2019-13272?

The vulnerability in the ptrace_link function mishandles the recording of process credentials, enabling local users to escalate privileges by exploiting certain parent-child process relationships.

The Impact of CVE-2019-13272

Local users can gain root privileges through specific exploitation scenarios involving process relationships.
The vulnerability arises from mishandling process credentials during ptrace relationship establishment.
Exploitation can occur when a parent process relinquishes privileges and invokes execve, potentially allowing control by an attacker.
The issue is exacerbated by an object lifespan problem and incorrect designation of a privileged ptrace relationship.
SELinux deny_ptrace may offer a workaround in certain environments.

Technical Details of CVE-2019-13272

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The ptrace_link function in the Linux kernel mishandles process credentials, leading to privilege escalation for local users.

Affected Systems and Versions

The Linux kernel versions prior to 5.1.17 are affected by this vulnerability.

Exploitation Mechanism

Local users can exploit specific parent-child process relationships to gain root privileges.
Exploitation involves scenarios where a parent process drops privileges and calls execve, potentially allowing control by an attacker.
Incorrect marking of a ptrace relationship as privileged contributes to the exploit.

Mitigation and Prevention

Protective measures and steps to mitigate the impact of CVE-2019-13272.

Immediate Steps to Take

Apply relevant security patches promptly.
Monitor system logs for any suspicious activity.
Restrict user privileges to minimize the impact of potential exploits.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement SELinux policies to enhance system security.
Conduct regular security audits and penetration testing to identify vulnerabilities.

Patching and Updates

Update the Linux kernel to version 5.1.17 or newer to address the vulnerability.
Stay informed about security advisories and patches released by Linux distributions and vendors.