CVE-2019-4448 : Security Advisory and Response

IBM DB2 High Performance Unload load for LUW versions 6.1, 6.1.0.1, 6.1.0.1 IF1, 6.1.0.2, 6.1.0.2 IF1, and 6.1.0.1 IF2 are affected by a vulnerability that allows low-privileged users to execute arbitrary code with root authority.

Understanding CVE-2019-4448

This CVE involves a privilege escalation vulnerability in IBM DB2 High Performance Unload load for LUW.

What is CVE-2019-4448?

The binaries db2hpum and db2hpum_debug in the affected versions have setuid root privileges, enabling users without high privileges to load arbitrary db2 libraries from a privileged context, leading to the execution of arbitrary code with root authority.

The Impact of CVE-2019-4448

CVSS Score: 8.4 (High)
Attack Vector: Local
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Exploit Code Maturity: Unproven
Privileges Required: None
User Interaction: None
This vulnerability poses a significant risk as it allows unauthorized users to gain root access, potentially leading to data breaches and system compromise.

Technical Details of CVE-2019-4448

This section provides more in-depth technical details of the vulnerability.

Vulnerability Description

The vulnerability in IBM DB2 High Performance Unload load for LUW versions 6.1, 6.1.0.1, 6.1.0.1 IF1, 6.1.0.2, 6.1.0.2 IF1, and 6.1.0.1 IF2 allows low-privileged users to execute arbitrary code with root authority due to the design of the setuid root binaries.

Affected Systems and Versions

Product: DB2 High Performance Unload load for LUW
Vendor: IBM
Versions: 6.1, 6.1.0.1, 6.1.0.1 IF1, 6.1.0.2, 6.1.0.2 IF1, 6.1.0.1 IF2

Exploitation Mechanism

The vulnerability arises from the inclusion of built-in options in the binaries that allow unauthorized users to load arbitrary db2 libraries from a privileged context, leading to the execution of unauthorized code with root privileges.

Mitigation and Prevention

To address CVE-2019-4448, follow these mitigation strategies:

Immediate Steps to Take

Apply the official fix provided by IBM to patch the vulnerability.
Restrict access to the vulnerable binaries to authorized users only.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement the principle of least privilege to restrict access rights.

Patching and Updates

Stay informed about security bulletins and updates from IBM.
Apply patches promptly to secure the system against potential exploits.