CVE-2019-3726 Explained : Impact and Mitigation

A vulnerability known as Uncontrolled Search Path Vulnerability affects certain versions of Dell Update Package (DUP) Framework files. The vulnerable versions include those prior to 19.1.0.413 for Dell Update Package (DUP) Framework files, versions prior to 103.4.6.69 used in Dell EMC Servers, and versions prior to 3.8.3.67 used in Dell Client Platforms. This vulnerability is specifically related to the DUP framework and can be exploited by a locally authenticated low privilege malicious user during the time when an administrator is executing a DUP. The attack involves tricking the administrator into running a trusted binary, which then loads a malicious DLL. Once the malicious DLL is loaded, the attacker gains the ability to execute arbitrary code on the victim's system. Importantly, this vulnerability does not impact the actual binary payload delivered by the DUP.

Understanding CVE-2019-3726

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2019-3726.

What is CVE-2019-3726?

CVE-2019-3726 is an Uncontrolled Search Path Vulnerability that affects Dell Update Package (DUP) Framework files used in Dell EMC Servers and Dell Client Platforms. It allows a malicious user to execute arbitrary code on a victim's system by exploiting the DUP framework.

The Impact of CVE-2019-3726

The vulnerability has the following impact based on CVSS v3.0 metrics:

Base Score: 6.7 (Medium)
Attack Vector: Local
Attack Complexity: High
Privileges Required: Low
User Interaction: Required
Confidentiality, Integrity, and Availability Impact: High

Technical Details of CVE-2019-3726

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from an Uncontrolled Search Path issue in the Dell Update Package (DUP) Framework files, allowing for arbitrary code execution.

Affected Systems and Versions

Dell EMC Servers: Networking and Fibre Channel Drivers: DUP Framework file versions less than 103.4.6.69
Dell EMC Servers: all other Drivers, BIOS, and Firmware: DUP Framework file versions less than 19.1.0.413
Dell Client Platforms: DUP Framework file versions less than 3.8.3.67

Exploitation Mechanism

The vulnerability can be exploited by a locally authenticated low privilege malicious user tricking an administrator into running a trusted binary, loading a malicious DLL, and gaining the ability to execute arbitrary code.

Mitigation and Prevention

Effective mitigation strategies are crucial to address CVE-2019-3726.

Immediate Steps to Take

Update Dell Update Package (DUP) Framework files to versions 19.1.0.413, 103.4.6.69, and 3.8.3.67 or higher.
Educate administrators on the risks of running untrusted binaries.

Long-Term Security Practices

Implement least privilege access controls to limit the impact of potential attacks.
Regularly monitor and audit system activity to detect any suspicious behavior.

Patching and Updates

Stay informed about security updates from Dell and promptly apply patches to mitigate known vulnerabilities.