CVE-2019-3749 : Exploit Details and Defense Strategies

Dell Command Update versions prior to 3.1 have an Arbitrary File Deletion Vulnerability that allows a locally authenticated malicious user to delete targeted files by creating a symlink. This vulnerability arises due to incorrect permission settings.

Understanding CVE-2019-3749

Dell Command Update (DCU) vulnerability with arbitrary file deletion.

What is CVE-2019-3749?

The vulnerability in Dell Command Update (DCU) versions less than 3.1 enables a low-privileged, locally authenticated user to delete specific files by creating a symlink.

The Impact of CVE-2019-3749

The vulnerability has a CVSS base score of 5.6 (Medium severity) with high availability impact. It allows for arbitrary file deletion by exploiting incorrect permission settings.

Technical Details of CVE-2019-3749

Details on the vulnerability in Dell Command Update (DCU).

Vulnerability Description

Vulnerability Type: Arbitrary File Deletion
Exploitation: Locally authenticated malicious user with low privileges
Method: Creating a symlink to the targeted file

Affected Systems and Versions

Product: Dell Command Update (DCU)
Vendor: Dell
Affected Versions: < 3.1

Exploitation Mechanism

Attacker creates a symlink between "Temp\ICProgress\Dell_InventoryCollector_Progress.xml" and the file to be deleted
Incorrect permission settings on the Temp directory facilitate the exploit

Mitigation and Prevention

Protecting systems from the CVE-2019-3749 vulnerability.

Immediate Steps to Take

Upgrade Dell Command Update to version 3.1 or higher
Monitor and restrict access to critical directories
Implement least privilege access controls

Long-Term Security Practices

Regularly review and adjust file permissions
Conduct security training for users on symlink vulnerabilities

Patching and Updates

Apply security patches and updates promptly to mitigate vulnerabilities