CVE-2010-2662 in Web Browser
Summary
by MITRE
Opera before 10.60 allows remote attackers to bypass the popup blocker via a javascript: URL and a "fake click."
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Analysis
by VulDB Data Team • 09/20/2021
The vulnerability identified as CVE-2010-2662 affects Opera web browsers prior to version 10.60 and represents a significant security flaw in the browser's popup blocking mechanism. This issue stems from a weakness in how the browser handles javascript: URLs within the context of user interaction simulation, allowing malicious actors to circumvent built-in security protections designed to prevent unwanted popups and advertisements. The vulnerability specifically targets the browser's popup blocker functionality, which is a critical component of modern web security implementations.
The technical exploitation of this vulnerability relies on the manipulation of javascript: URLs in conjunction with a technique known as "fake click" simulation. Attackers can craft malicious web pages that contain javascript: URLs designed to trigger popup windows while simultaneously employing JavaScript methods to simulate user interactions that bypass the browser's popup blocking logic. This approach exploits a fundamental flaw in the browser's trust model where it fails to properly validate the authenticity of user-generated events when processing javascript: URLs. The vulnerability essentially allows attackers to execute arbitrary popup windows without user consent, effectively neutralizing the popup blocker's protective capabilities.
The operational impact of this vulnerability extends beyond simple annoyance, as it can be leveraged for various malicious activities including phishing attacks, drive-by downloads, and advertisement-based revenue generation through fraudulent popup campaigns. When an attacker successfully bypasses the popup blocker, they gain the ability to display unwanted content that could contain malware, attempt to harvest user credentials, or redirect users to malicious websites. This vulnerability directly violates the principle of least privilege in web browser security, where users expect their browser settings to be respected and enforced. The attack vector is particularly dangerous because it requires no special privileges or complex exploitation techniques, making it accessible to even novice attackers.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-602 Client Side Enforcement of Server Side Security, as it demonstrates how client-side security mechanisms can be bypassed through clever manipulation of browser APIs. The issue also relates to ATT&CK technique T1203 Exploitation for Client Execution, where attackers leverage browser vulnerabilities to execute malicious code in the user's context. Organizations using affected Opera versions face significant risk as this vulnerability can be exploited through various attack vectors including malicious websites, compromised advertising networks, or social engineering campaigns that direct users to exploit the flaw. The vulnerability underscores the importance of keeping browser software updated and maintaining current security patches as even minor versions can contain critical security flaws.
The mitigation strategy for this vulnerability requires immediate installation of Opera version 10.60 or later, which includes patches addressing the popup blocker bypass mechanism. Additionally, users should implement multiple layers of defense including browser security extensions, content filtering solutions, and regular security updates. Network administrators should consider implementing web application firewalls and content filtering solutions that can detect and block suspicious javascript: URL patterns. The vulnerability also highlights the importance of user education regarding safe browsing practices and the recognition of potentially malicious popup content, as social engineering remains a critical component in successful exploitation of such browser vulnerabilities.