CVE-2021-45039 : Exploit Details and Defense Strategies

Multiple models of the Uniview IP Camera contain a vulnerability that allows a remote attacker to execute arbitrary code through a buffer overflow attack.

Understanding CVE-2021-45039

This CVE identifies a critical vulnerability in Uniview IP Cameras that can lead to remote code execution.

What is CVE-2021-45039?

The Uniview IP Camera models mentioned have an undocumented UDP service on port 7788 that enables a remote unauthenticated attacker to trigger a buffer overflow, leading to code execution and initiation of telnetd service with default credentials.

The Impact of CVE-2021-45039

Allows remote unauthenticated attackers to execute arbitrary code
Potential unauthorized access to the camera system
Risks associated with hardcoded default credentials

Technical Details of CVE-2021-45039

The vulnerability details and affected systems of CVE-2021-45039

Vulnerability Description

Vulnerability in Uniview IP Cameras allowing buffer overflow
Remote unauthenticated attacker exploitation to start telnetd service

Affected Systems and Versions

Vendor: Uniview
Product: IP Camera models including IPC_G6103, IPC_G61, IPC21, IPC23, IPC32, IPC36, IPC62, IPC_HCMN
Versions: B6103.16.10.B25.201218

Exploitation Mechanism

Undocumented UDP service on port 7788 used for exploitation
Buffer overflow to trigger code execution

Mitigation and Prevention

Steps to mitigate and prevent CVE-2021-45039

Immediate Steps to Take

Disable UDP service on port 7788 or block access externally
Change default credentials for the telnetd service

Long-Term Security Practices

Regularly update firmware to patched versions
Implement network segmentation to restrict camera access

Patching and Updates

Follow vendor recommendations for firmware updates and security patches