CVE-2020-3929 : Exploit Details and Defense Strategies

GeoVision Door Access Control Device - Shared cryptographic keys

Understanding CVE-2020-3929

This CVE involves the use of shared cryptographic private keys in GeoVision Door Access Control devices, potentially leading to security vulnerabilities.

What is CVE-2020-3929?

GeoVision Door Access Control devices utilize shared cryptographic private keys for SSH and HTTPS, which could allow attackers to perform Man-in-the-Middle (MITM) attacks and recover plaintext from encrypted messages.

The Impact of CVE-2020-3929

The vulnerability has a CVSS base score of 5.9, with a medium severity rating. It poses a high risk to confidentiality as attackers can exploit the shared keys to intercept sensitive information.

Technical Details of CVE-2020-3929

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

Vulnerability Description

The vulnerability arises from the shared cryptographic private keys used in GeoVision Door Access Control devices, enabling potential MITM attacks and plaintext recovery of encrypted messages.

Affected Systems and Versions

Door Access Control Device versions GV-AS210, GV-AS410, and GV-AS810 (<= 2.21)
Door Access Control Device version GV-GF192x (<= 1.10)
Door Access Control Device version GV-AS1010 (<= 1.32)

Exploitation Mechanism

Attackers can exploit the shared cryptographic private keys to intercept and decrypt sensitive information transmitted over SSH and HTTPS connections.

Mitigation and Prevention

Protecting systems from CVE-2020-3929 is crucial to maintaining security.

Immediate Steps to Take

Update affected devices to version 2.22 in GV-AS210, GV-AS410, and GV-AS810
Update GV-GF192x to version 1.22
Update GV-AS1010 to version 1.33

Long-Term Security Practices

Implement unique cryptographic keys for each device
Regularly monitor and update cryptographic protocols
Conduct security audits to identify vulnerabilities

Patching and Updates

Ensure timely installation of security patches and updates to address the shared cryptographic key issue in GeoVision Door Access Control devices.