Learn about CVE-2021-21993, a Server Side Request Forgery vulnerability impacting VMware vCenter Server and Cloud Foundation. Discover the impact, affected systems, exploitation, and mitigation steps.
A Server Side Request Forgery (SSRF) vulnerability has been identified in VMware vCenter Server and VMware Cloud Foundation due to improper validation of URLs in vCenter Server Content Library. This vulnerability could allow an authorized user to exploit the server, potentially leading to information disclosure.
Understanding CVE-2021-21993
This section will provide insights into the nature of the vulnerability and its impact on affected systems.
What is CVE-2021-21993?
The SSRF vulnerability in VMware vCenter Server and VMware Cloud Foundation arises from inadequate validation of URLs in the vCenter Server Content Library. Authenticated users with access to the content library could leverage this flaw to send a POST request to the vCenter Server, potentially resulting in the disclosure of sensitive information.
The Impact of CVE-2021-21993
The presence of this vulnerability poses a significant risk to the confidentiality of data stored within affected systems. Unauthorized access through SSRF could lead to the exposure of sensitive information, undermining the security posture of organizations utilizing VMware products.
Technical Details of CVE-2021-21993
In this section, we will delve deeper into the technical aspects of the vulnerability to provide a comprehensive understanding of its implications.
Vulnerability Description
The SSRF issue in VMware vCenter Server and VMware Cloud Foundation is a result of the failure to validate URLs in the content library adequately. This oversight enables attackers to manipulate requests, potentially leading to unauthorized access and information leakage.
Affected Systems and Versions
The vulnerability affects VMware vCenter Server versions 7.x before 7.0 U2c, 6.7 before 6.7 U3o, and 6.5 before 6.5 U3q, as well as VMware Cloud Foundation versions 4.x before 4.3 and 3.x before 3.10.2.2.
Exploitation Mechanism
By sending a crafted POST request to the vCenter Server, attackers can exploit the SSRF vulnerability to bypass security controls and gain unauthorized access to sensitive information within the content library.
Mitigation and Prevention
This section outlines strategies to mitigate the risks associated with CVE-2021-21993 and prevent potential security breaches.
Immediate Steps to Take
Organizations using the affected versions of VMware products should apply security patches or updates provided by VMware promptly. Additionally, restricting access to the content library can help mitigate the risk of exploitation.
Long-Term Security Practices
Implementing robust URL validation mechanisms and conducting regular security audits can enhance the overall security posture of VMware environments. Employee training on identifying and reporting suspicious activities is also crucial in preventing SSRF attacks.
Patching and Updates
Stay informed about security advisories and updates released by VMware to address vulnerabilities such as SSRF in vCenter Server and Cloud Foundation. Regularly update systems and apply patches to ensure protection against potential exploits.