CVE-2002-0722 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 5.01, 5.5, and 6.0 allows remote attackers to misrepresent the source of a file in the File Download dialogue box to trick users into thinking that the file type is safe to download, aka "File Origin Spoofing."
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Analysis
by VulDB Data Team • 04/07/2017
This vulnerability resides in the Microsoft Internet Explorer web browser versions 5.01, 5.5, and 6.0, where attackers can manipulate the file download dialogue box to display misleading information about the file source. The flaw specifically targets the user interface element that informs users about the origin of downloaded files, creating a deceptive environment where malicious actors can present forged source information to users. This vulnerability is categorized under CWE-16 as a configuration issue within the software's security controls, particularly affecting the integrity of user security notifications. The attack vector operates through web-based delivery where an attacker crafts a malicious webpage that, when accessed by a victim using an affected browser version, displays a forged file origin in the download dialog.
The technical implementation of this vulnerability exploits the browser's failure to properly validate or authenticate the source information displayed during file downloads. When a user attempts to download a file, Internet Explorer should clearly indicate the actual source of the file, typically displaying the domain or server name from which the file originated. However, this vulnerability allows attackers to manipulate the displayed source information, making it appear as though the file originates from a trusted source such as a corporate intranet or well-known legitimate website. The deception occurs at the presentation layer of the browser's security model, where the user interface elements that communicate security information are compromised, creating a false sense of security for end users.
The operational impact of this vulnerability extends beyond simple phishing attempts, as it fundamentally undermines user trust in the browser's security notifications and can lead to significant compromise of systems. Users who believe they are downloading files from trusted sources may unknowingly execute malicious code or download harmful software that would not have been downloaded if they had been properly informed of the actual source. This vulnerability aligns with ATT&CK technique T1059 which involves executing malicious code through deceptive user interactions, and T1566 which covers social engineering tactics to gain initial access. The attack can result in complete system compromise when users download and execute malicious files, potentially leading to data exfiltration, lateral movement within networks, or establishment of persistent backdoors.
Mitigation strategies for this vulnerability include immediate patching of affected Internet Explorer versions, which was provided by Microsoft through security updates. Organizations should implement browser hardening policies that disable unnecessary features and enforce security configurations that limit the exposure to such UI spoofing attacks. Network-level controls such as web proxies with content filtering capabilities can help identify and block malicious downloads, while user education programs should emphasize the importance of verifying file sources regardless of what the browser interface indicates. Additionally, implementing application whitelisting policies and maintaining up-to-date antivirus signatures can provide additional layers of protection against exploitation of this vulnerability. The vulnerability demonstrates the critical importance of maintaining secure user interface elements in security software, as these interfaces serve as the primary means of communicating security status to end users.