CVE-2006-1626 in Internet Explorer
Summary
by MITRE
Internet Explorer 6 for Windows XP SP2 and earlier allows remote attackers to spoof the address bar and possibly conduct phishing attacks by re-opening the window to a malicious Shockwave Flash application, then changing the window location back to a trusted URL while the Flash application is still loading. NOTE: this is a different vulnerability than CVE-2006-1192.
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Analysis
by VulDB Data Team • 03/12/2021
This vulnerability represents a sophisticated browser-based attack vector that exploits a fundamental flaw in Internet Explorer 6's handling of window navigation and address bar display during Flash content loading processes. The security issue specifically affects Windows XP systems with Service Pack 2 or earlier versions of Internet Explorer 6, creating a window of opportunity for malicious actors to manipulate user perception and potentially harvest sensitive information through deceptive means.
The technical implementation of this vulnerability relies on the specific timing and sequence of browser operations during Shockwave Flash application execution. Attackers can leverage the window reopening mechanism to force a malicious Flash application to load while simultaneously manipulating the browser's location bar to display a trusted website URL. This creates a deceptive environment where users believe they are interacting with a legitimate site while actually engaging with malicious content that can be designed to capture credentials, personal information, or execute additional malware.
The operational impact of this vulnerability extends beyond simple phishing attempts to encompass broader security implications for enterprise environments and individual users. This flaw directly violates the principle of least privilege and user trust by allowing attackers to bypass standard security mechanisms that users rely upon for identifying legitimate websites. The vulnerability operates at the application layer and leverages the browser's rendering engine to create a false sense of security, making it particularly dangerous for users who may not recognize the deception until after providing sensitive information.
From a cybersecurity perspective, this vulnerability aligns with several CWE categories including CWE-611, which addresses improper access control in web applications, and CWE-20, which covers input validation issues that can lead to security bypasses. The attack pattern follows methodologies consistent with the ATT&CK framework's T1566, which encompasses social engineering techniques including phishing attacks. The vulnerability demonstrates the critical importance of maintaining up-to-date browser security patches and implementing comprehensive user education programs to recognize deceptive web interfaces.
The mitigation strategy for this vulnerability requires immediate implementation of security updates from Microsoft, specifically targeting the Internet Explorer 6 security patches that address the window navigation and address bar display handling. Organizations should also consider implementing additional security controls such as browser hardening measures, network-based filtering solutions, and user awareness training to reduce the risk of successful exploitation. Regular security assessments should verify that all systems have been properly patched and that no legacy browsers remain in use within the enterprise environment.