CVE-2020-26574 : Exploit Details and Defense Strategies

Leostream Connection Broker 8.2.x is affected by stored XSS vulnerability that allows an unauthenticated attacker to inject malicious JavaScript code. This can lead to the execution of arbitrary Perl scripts as root.

Understanding CVE-2020-26574

Leostream Connection Broker 8.2.x vulnerability allows for the injection of JavaScript code via the User-Agent HTTP header, potentially leading to remote code execution.

What is CVE-2020-26574?

The vulnerability in Leostream Connection Broker 8.2.x enables attackers to inject JavaScript code through the webquery.pl User-Agent HTTP header, which can be used to execute malicious Perl scripts as root.

The Impact of CVE-2020-26574

This vulnerability poses a severe risk as it allows unauthenticated attackers to compromise the system by executing arbitrary code, potentially leading to unauthorized access and control of the affected system.

Technical Details of CVE-2020-26574

Leostream Connection Broker 8.2.x vulnerability has the following technical details:

Vulnerability Description

Stored XSS vulnerability in Leostream Connection Broker 8.2.x
Attackers can inject JavaScript code via the User-Agent HTTP header
Malicious code can lead to the execution of Perl scripts as root

Affected Systems and Versions

Leostream Connection Broker 8.2.x
Products that are no longer supported by the maintainer

Exploitation Mechanism

Unauthenticated attackers inject JavaScript code via the webquery.pl User-Agent HTTP header
Admins unknowingly render the injected code upon login
The injected code can force admins to upload and execute malicious Perl scripts as root via libMisc::browser_client

Mitigation and Prevention

To address CVE-2020-26574, consider the following steps:

Immediate Steps to Take

Disable or restrict access to the affected Leostream Connection Broker
Implement network-level controls to filter out malicious requests

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities
Conduct security assessments and audits to identify and mitigate risks

Patching and Updates

Check for patches or updates from Leostream for a fix to the vulnerability
Apply security updates promptly to protect the system from potential exploits