CVE-2020-4739 : Exploit Details and Defense Strategies

IBM DB2 for Linux, UNIX, and Windows versions 9.7, 10.1, 10.5, 11.1, and 11.5 are affected by a DLL search order hijacking vulnerability that could allow a local authenticated attacker to execute arbitrary code on the system.

Understanding CVE-2020-4739

This CVE involves a security vulnerability in IBM DB2 for Linux, UNIX, and Windows that could lead to arbitrary code execution by an attacker.

What is CVE-2020-4739?

IBM DB2 for Linux, UNIX, and Windows versions 9.7, 10.1, 10.5, 11.1, and 11.5 are susceptible to a DLL search order hijacking vulnerability in the Microsoft Windows client. This flaw could be exploited by a local authenticated attacker to run malicious code on the system.

The Impact of CVE-2020-4739

The vulnerability has a CVSS base score of 7.8, indicating a high severity level. It poses a significant risk to confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2020-4739

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

Vulnerability Description

The vulnerability allows a local authenticated attacker to execute arbitrary code on the system by manipulating DLL search order in the Microsoft Windows client.

Affected Systems and Versions

IBM DB2 for Linux, UNIX, and Windows 9.7
IBM DB2 for Linux, UNIX, and Windows 10.1
IBM DB2 for Linux, UNIX, and Windows 10.5
IBM DB2 for Linux, UNIX, and Windows 11.1
IBM DB2 for Linux, UNIX, and Windows 11.5

Exploitation Mechanism

By placing a specially crafted file in a compromised folder, an attacker with local authentication can exploit the vulnerability to execute arbitrary code on the system.

Mitigation and Prevention

Protecting systems from CVE-2020-4739 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply official fixes provided by IBM to address the vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation.
Restrict access to critical system files and directories.

Long-Term Security Practices

Regularly update and patch IBM DB2 installations to prevent known vulnerabilities.
Conduct security training for users to recognize and report suspicious activities.
Implement least privilege access controls to limit the impact of potential attacks.
Utilize security tools to detect and prevent DLL search order hijacking attempts.
Stay informed about security advisories and updates from IBM.

Patching and Updates

IBM has released official fixes to address the vulnerability. It is crucial to apply these patches promptly to secure the affected systems.