CVE-2020-26291 Explained : Impact and Mitigation

URI.js is a javascript URL mutation library that allows for hostname spoofing in versions prior to 1.19.4. This vulnerability can lead to incorrect security decisions and various attacks like SSRF or open redirects.

Understanding CVE-2020-26291

URI.js versions before 1.19.4 are susceptible to hostname spoofing, potentially resulting in security bypasses and other malicious activities.

What is CVE-2020-26291?

URI.js, a URL mutation library, allows for hostname spoofing by manipulating the URL structure, leading to incorrect security decisions and potential vulnerabilities.

The Impact of CVE-2020-26291

Attackers can exploit this vulnerability to bypass security measures, conduct SSRF attacks, or perform open redirects.
Incorrectly parsed URLs can lead to unexpected behavior, allowing malicious actors to manipulate the hostname for their benefit.

Technical Details of CVE-2020-26291

URI.js vulnerability details and affected systems.

Vulnerability Description

In URI.js versions < 1.19.4, a backslash followed by an at character can spoof the hostname, impacting security decisions.

Affected Systems and Versions

Product: URI.js
Vendor: medialize
Versions Affected: < 1.19.4

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Integrity Impact: High
Privileges Required: Low

Mitigation and Prevention

Protecting systems from CVE-2020-26291.

Immediate Steps to Take

Update URI.js to version 1.19.4 or higher to patch the vulnerability.
Review and adjust security decisions that rely on hostname information.

Long-Term Security Practices

Regularly update libraries and dependencies to prevent known vulnerabilities.
Implement input validation and sanitization to mitigate similar issues.

Patching and Updates

Ensure all systems using URI.js are updated to version 1.19.4 or above to address the hostname spoofing vulnerability.