CVE-2021-43807 : Vulnerability Insights and Analysis

Opencast versions prior to 9.10 are vulnerable to HTTP method spoofing, allowing attackers to manipulate HTTP methods via URL parameters, leading to potential cybersecurity risks.

Understanding CVE-2021-43807

Opencast's HTTP method spoofing vulnerability exposes systems to unauthorized HTTP requests manipulation.

What is CVE-2021-43807?

Opencast versions before 9.10 contain a security flaw that enables HTTP method spoofing, enabling attackers to alter HTTP methods via URLs, thus circumventing request restrictions and facilitating CSRF attacks.

The Impact of CVE-2021-43807

The vulnerability in Opencast could result in high impacts on confidentiality, integrity, and availability of data, potentially leading to unauthorized server state changes.

Technical Details of CVE-2021-43807

Opencast's vulnerability entails several technical aspects that affect system security.

Vulnerability Description

The flaw in Opencast versions < 9.10 allows attackers to modify assumed HTTP methods through URL parameters, enabling them to transform GET requests into PUT requests or execute DELETE requests via HTTP forms.

Affected Systems and Versions

Product: Opencast
Vendor: Opencast
Vulnerable Versions: < 9.10

Exploitation Mechanism

Attackers exploit this vulnerability by manipulating URL parameters to change HTTP methods, bypassing security controls and executing malicious actions like CSRF attacks.

Mitigation and Prevention

Protecting systems from CVE-2021-43807 requires immediate actions and long-term security measures.

Immediate Steps to Take

Upgrade Opencast to version 9.10 or newer.
Consider setting the

SameSite=Strict

attribute for cookies.

Long-Term Security Practices

Regularly monitor and update security configurations.
Conduct security assessments to identify vulnerabilities.

Patching and Updates

Apply security patches promptly.