CVE-2020-25205 : What You Need to Know

Mimosa B5, B5c, and C5x firmware versions up to 2.8.0.2 are susceptible to stored XSS attacks, allowing unauthenticated attackers to inject arbitrary JavaScript into the web console's welcome message.

Understanding CVE-2020-25205

This CVE identifies a vulnerability in the web console of Mimosa B5, B5c, and C5x firmware versions up to 2.8.0.2.

What is CVE-2020-25205?

The vulnerability lies in the set_banner() function of /var/www/core/controller/index.php, enabling attackers to manipulate the /mnt/jffs2/banner.txt file with malicious JavaScript.

The Impact of CVE-2020-25205

Attackers can inject arbitrary JavaScript into the welcome/banner message displayed to unauthenticated users on the web console login page.
This vulnerability is absent in older 1.5.x firmware versions.

Technical Details of CVE-2020-25205

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

Vulnerability Description

The stored XSS vulnerability in the set_banner() function allows unauthenticated attackers to modify the contents of the banner.txt file with malicious JavaScript.

Affected Systems and Versions

Mimosa B5, B5c, and C5x firmware versions up to 2.8.0.2

Exploitation Mechanism

Attackers can exploit the vulnerability by setting the contents of the banner.txt file to include arbitrary JavaScript.

Mitigation and Prevention

Protecting systems from CVE-2020-25205 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the firmware to the latest version that addresses the vulnerability.
Monitor web console activity for any suspicious behavior.

Long-Term Security Practices

Implement strict input validation to prevent XSS attacks.
Regularly audit and review web console configurations for security gaps.

Patching and Updates

Apply patches and updates provided by Mimosa to fix the vulnerability.