CVE-2019-12439 : Exploit Details and Defense Strategies

Bubblewrap software version prior to 0.3.3 has a vulnerability in the bubblewrap.c file that allows local attackers to obstruct execution or potentially execute unauthorized code.

Understanding CVE-2019-12439

An issue in Bubblewrap software version prior to 0.3.3 allows local attackers to exploit temporary directories in /tmp, affecting the execution of bubblewrap by other users.

What is CVE-2019-12439?

The vulnerability in Bubblewrap software version prior to 0.3.3 arises from incorrect usage of temporary directories in /tmp as a mount point, enabling local attackers to interfere with bubblewrap execution.

The Impact of CVE-2019-12439

CVSS Base Score: 7.4 (High)
Attack Vector: Local
Attack Complexity: High
Privileges Required: None
Confidentiality, Integrity, and Availability Impact: High
Scope: Unchanged
User Interaction: None

Technical Details of CVE-2019-12439

Bubblewrap before version 0.3.3 misuses temporary directories in /tmp as a mount point, allowing local attackers to disrupt the execution of bubblewrap or potentially execute unauthorized code.

Vulnerability Description

The vulnerability stems from the incorrect usage of temporary directories in /tmp as a mount point, specifically related to XDG_RUNTIME_DIR configurations, enabling local attackers to impede bubblewrap execution.

Affected Systems and Versions

Affected Version: Bubblewrap software version prior to 0.3.3

Exploitation Mechanism

Local attackers with access to the system can exploit the flaw in Bubblewrap to obstruct the execution of bubblewrap by other users or potentially execute unauthorized code.

Mitigation and Prevention

To address CVE-2019-12439, consider the following steps:

Immediate Steps to Take

Update Bubblewrap to version 0.3.3 or later to mitigate the vulnerability.
Monitor for any unauthorized code execution or interference with bubblewrap.

Long-Term Security Practices

Implement proper directory permissions and access controls to prevent unauthorized access.
Regularly review and update system configurations to enhance security.

Patching and Updates

Apply patches and updates provided by Bubblewrap to address the vulnerability and enhance system security.