CVE-2012-6471 in Web Browser
Summary
by MITRE
Opera before 12.12 allows remote attackers to spoof the address field via a high rate of HTTP requests.
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Analysis
by VulDB Data Team • 12/21/2021
The vulnerability described in CVE-2012-6471 represents a significant security flaw in Opera web browsers prior to version 12.12, specifically targeting the browser's address bar spoofing capabilities. This issue enables remote attackers to manipulate the display of the address field through excessive HTTP request rates, potentially deceiving users about the true origin of web content they are interacting with. The flaw exploits the browser's handling of rapid connection attempts and HTTP response processing, creating a window where malicious actors can present misleading URL information to unsuspecting users.
This vulnerability operates at the intersection of web browser security architecture and user interface deception mechanisms, fundamentally compromising the trust model that users place in their browser's address bar. The technical implementation involves leveraging the browser's connection management system to trigger rapid successive HTTP requests that can cause the address bar to display forged or manipulated URL information. Attackers can exploit this by initiating multiple concurrent connections to malicious servers, causing the browser to display false address information that appears legitimate to users. The vulnerability specifically affects how Opera handles rapid request sequences and processes HTTP responses, creating an inconsistency between the actual server being accessed and the information displayed in the address field.
The operational impact of this vulnerability extends beyond simple phishing attacks, as it undermines the fundamental security principle of user authentication and trust in browser interfaces. Users may be deceived into believing they are visiting legitimate websites while actually interacting with malicious servers, potentially leading to credential theft, data exfiltration, or malware installation. The high rate of HTTP requests required to trigger this vulnerability suggests that attackers would need to orchestrate sophisticated traffic patterns, though the actual exploitation could be automated through various means including compromised websites or network interception. This flaw particularly affects users who rely on the address bar as a primary indicator of website legitimacy, creating a dangerous environment where user trust in browser security mechanisms is compromised.
From a cybersecurity perspective, this vulnerability aligns with CWE-642, which addresses "External Control of Critical State Data," as it involves manipulation of browser state information through external HTTP traffic patterns. The attack vector demonstrates characteristics consistent with the attacker tactics described in the MITRE ATT&CK framework under the T1056 category, specifically focusing on credential access through user interface manipulation. The vulnerability also relates to broader web security concepts including man-in-the-middle attacks and session hijacking, where the integrity of user interface elements becomes compromised. Organizations and users affected by this vulnerability would need to implement immediate browser updates, network monitoring for unusual HTTP request patterns, and user education regarding the importance of verifying website authenticity through multiple means beyond address bar information.
The remediation approach for CVE-2012-6471 required users to upgrade to Opera version 12.12 or later, which included patches to the browser's HTTP request handling and address bar display mechanisms. Security professionals should have implemented network monitoring to detect unusual patterns of rapid HTTP requests that could indicate exploitation attempts. Additionally, organizations needed to ensure comprehensive browser update policies were in place to protect against similar vulnerabilities in other software components. The vulnerability highlighted the importance of maintaining up-to-date browser software and demonstrated how seemingly minor implementation flaws in web browser security could have significant real-world consequences for user trust and data protection.