CVE-2020-3924 : Exploit Details and Defense Strategies

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, have a vulnerability that allows attackers to inject malicious commands into patch files, potentially compromising system security.

Understanding CVE-2020-3924

This CVE involves a firmware injection vulnerability in TONNET DVR products.

What is CVE-2020-3924?

The vulnerability in TONNET DVR firmware allows attackers to insert specific commands into patch files, leading to unauthorized access to the system.

The Impact of CVE-2020-3924

CVSS Base Score: 6.4 (Medium Severity)
Attack Vector: Network
Attack Complexity: High
Privileges Required: High
User Interaction: Required
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2020-3924

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability arises from the lack of proper verification of patch files in TONNET DVR firmware, enabling attackers to execute unauthorized commands.

Affected Systems and Versions

Affected Platforms: TAT-76 series, TAT-77 series
Affected Versions:
TAT-76 series: <= version 20191216
TAT-77 series: <= version 20200213

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting specific commands into patch files, bypassing security measures and gaining system access.

Mitigation and Prevention

To address CVE-2020-3924, users should take immediate and long-term security measures.

Immediate Steps to Take

Update TAT-76 series to version 20191216
Update TAT-77 series to version 20200213

Long-Term Security Practices

Regularly monitor and update firmware to the latest versions
Implement network segmentation and access controls

Patching and Updates

Regularly check for firmware updates and apply patches promptly to mitigate the risk of exploitation.