CVE-2020-8289 : Exploit Details and Defense Strategies

Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 are affected by improper certificate validation, potentially leading to remote code execution.

Understanding CVE-2020-8289

This CVE involves a vulnerability in Backblaze software that could allow an attacker to execute code remotely.

What is CVE-2020-8289?

The vulnerability arises from improper certificate validation in the

bztransmit

helper due to a hardcoded whitelist of strings in URLs, where validation is disabled. This flaw could be exploited through the client update functionality.

The Impact of CVE-2020-8289

The vulnerability could result in possible remote code execution on systems running affected versions of Backblaze for Windows and macOS.

Technical Details of CVE-2020-8289

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in Backblaze software allows for improper certificate validation, enabling potential remote code execution.

Affected Systems and Versions

Backblaze for Windows before 7.0.1.433
Backblaze for macOS before 7.0.1.434

Exploitation Mechanism

The vulnerability can be exploited through the

bztransmit

helper due to a whitelist bypass in URL strings.

Mitigation and Prevention

Protecting systems from CVE-2020-8289 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Backblaze software to versions 7.0.1.433 for Windows and 7.0.1.434 for macOS.
Monitor for any unusual activities on the network.

Long-Term Security Practices

Regularly update software and security patches.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure that all systems are updated with the latest versions of Backblaze to mitigate the vulnerability.