CVE-2021-28048 : Security Advisory and Response
Learn about CVE-2021-28048 where an overly permissive CORS policy in Devolutions Server enables remote attackers to leak cross-origin data, impacting systems before certain versions.
An overview of CVE-2021-28048, detailing the vulnerability, impact, technical details, and mitigation steps.
Understanding CVE-2021-28048
In this section, we will explore the specifics of CVE-2021-28048.
What is CVE-2021-28048?
CVE-2021-28048 is characterized by an overly permissive CORS policy in Devolutions Server before 2021.1 and Devolutions Server LTS before 2020.3.18. This security flaw enables a remote attacker to leak cross-origin data through a specially crafted HTML page.
The Impact of CVE-2021-28048
The vulnerability exposes affected systems to the risk of data leakage and potential exploitation by malicious actors, compromising the confidentiality and integrity of cross-origin data.
Technical Details of CVE-2021-28048
This section delves into the technical aspects of CVE-2021-28048.
Vulnerability Description
The vulnerability arises from an inadequately restricted Cross-Origin Resource Sharing (CORS) policy in specific versions of Devolutions Server, facilitating unauthorized access to sensitive information.
Affected Systems and Versions
Devolutions Server versions before 2021.1 and Devolutions Server LTS versions prior to 2020.3.18 are susceptible to this security flaw.
Exploitation Mechanism
Remote attackers can exploit the permissive CORS policy by leveraging a maliciously crafted HTML page to retrieve cross-origin data from the targeted system.
Mitigation and Prevention
In this section, we will outline essential steps to mitigate the risks associated with CVE-2021-28048.
Immediate Steps to Take
To address this vulnerability, users are advised to upgrade Devolutions Server to the latest non-vulnerable version promptly. Additionally, configuring stricter CORS policies can help mitigate the risk of data leakage.
Long-Term Security Practices
Implementing regular security audits, enhancing web application security measures, and staying informed about potential threats and updates are crucial for maintaining a secure environment.
Patching and Updates
Regularly monitor official security advisories and promptly apply patches and updates released by Devolutions to address known vulnerabilities and enhance system security.