CVE-2019-0643 in Edge
Summary
by MITRE
An information disclosure vulnerability exists in the way that Microsoft Edge handles cross-origin requests, aka 'Microsoft Edge Information Disclosure Vulnerability'.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/10/2023
The CVE-2019-0643 vulnerability represents a critical information disclosure flaw in Microsoft Edge browser that arises from improper handling of cross-origin requests. This vulnerability falls under the CWE-200 category of "Information Exposure" and specifically manifests when the browser fails to adequately sanitize or restrict data access between different origin domains. The issue stems from the browser's security model implementation where cross-origin resource sharing policies are not properly enforced during request processing, allowing malicious actors to potentially access sensitive information from other origins.
The technical exploitation of this vulnerability occurs when Microsoft Edge processes cross-origin requests without sufficient validation mechanisms. When a web application makes a request to a resource hosted on a different origin, the browser should enforce strict security policies to prevent unauthorized data access. However, in this case, the browser's implementation contains a flaw that allows information to leak between different security domains. The vulnerability specifically affects how Edge manages the interaction between different origin domains, potentially exposing cookies, session tokens, or other sensitive data that should remain isolated between origins.
From an operational impact perspective, this vulnerability creates significant risks for users and organizations relying on Microsoft Edge for web browsing activities. Attackers can leverage this flaw to conduct cross-site scripting attacks or perform data exfiltration from legitimate web applications. The vulnerability enables adversaries to bypass the same-origin policy that is fundamental to web security, potentially leading to session hijacking, credential theft, or access to confidential user data. Security researchers have noted that this issue particularly affects enterprise environments where users may access sensitive corporate applications through Edge browser, making the operational impact more severe.
The mitigation strategies for CVE-2019-0643 primarily involve applying Microsoft's security patches and updates as released through their regular update cycle. Organizations should ensure that all Edge browsers are updated to versions that contain the necessary fixes for this vulnerability. Additionally, network administrators should implement monitoring solutions to detect anomalous cross-origin request patterns that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1071.001 for application layer protocol: web protocols and can be addressed through defensive measures such as implementing Content Security Policy headers, enabling strict CORS policies, and conducting regular security assessments of web applications to identify potential cross-origin access issues. Organizations should also consider deploying web application firewalls and monitoring solutions that can detect and prevent unauthorized cross-origin data access patterns that could exploit this vulnerability.