CVE-2021-30582 in Chrome
Summary
by MITRE • 08/04/2021
Inappropriate implementation in Animation in Google Chrome prior to 92.0.4515.107 allowed a remote attacker to leak cross-origin data via a crafted HTML page.
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Analysis
by VulDB Data Team • 08/07/2021
The vulnerability CVE-2021-30582 represents a critical security flaw in Google Chrome's animation implementation that existed prior to version 92.0.4515.107. This issue falls under the category of improper implementation within the browser's rendering engine, specifically affecting how animations handle cross-origin data access. The vulnerability stems from insufficient validation mechanisms that allow malicious actors to exploit the animation subsystem to extract sensitive information from different origin contexts. The flaw demonstrates a classic example of a cross-origin information leakage vulnerability where the animation processing logic fails to properly enforce the same-origin policy, creating an attack surface that can be leveraged by remote adversaries.
The technical exploitation of this vulnerability occurs through crafted HTML pages that manipulate animation properties to trigger data leakage mechanisms. Attackers can construct malicious web pages that utilize specific animation sequences and timing behaviors to access and exfiltrate data from other origins. The underlying implementation flaw likely involves the animation engine's interaction with the browser's security boundaries, where animation frame callbacks or property transitions fail to properly validate the origin context of the data being processed. This type of vulnerability is particularly dangerous because it operates at the rendering layer where animations are processed, making it difficult to detect through traditional network-based security measures.
The operational impact of CVE-2021-30582 extends beyond simple data leakage, as it enables sophisticated cross-origin attacks that can compromise user privacy and system integrity. Remote attackers can leverage this vulnerability to gather sensitive information from different web domains, potentially including authentication tokens, personal data, or confidential business information. The vulnerability's classification aligns with CWE-200, which addresses "Information Exposure," and represents a significant breach of the browser's security model. This type of flaw can be particularly damaging in enterprise environments where users may access multiple domains with varying security contexts, creating potential for widespread data compromise.
Mitigation strategies for this vulnerability require immediate patching of affected Chrome versions to the recommended build 92.0.4515.107 or later, which contains the necessary security fixes. Organizations should also implement additional protective measures including network monitoring for suspicious animation-based traffic patterns and browser security configuration hardening. The remediation process should include comprehensive testing to ensure that the patched version properly handles cross-origin animation scenarios without introducing performance regressions. Security teams should also consider implementing content security policies that restrict animation-related JavaScript execution and monitor for unusual cross-origin resource access patterns that might indicate exploitation attempts. This vulnerability underscores the importance of maintaining up-to-date browser security implementations and demonstrates how seemingly innocuous features like animations can become attack vectors when proper security boundaries are not maintained.