CVE-2017-0231 in Internet Explorer
Summary
by MITRE
A spoofing vulnerability exists when Microsoft browsers render SmartScreen Filter, aka "Microsoft Browser Spoofing Vulnerability."
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Analysis
by VulDB Data Team • 12/22/2020
The Microsoft Browser Spoofing Vulnerability identified as CVE-2017-0231 represents a critical security flaw in how Microsoft browsers handle SmartScreen Filter rendering processes. This vulnerability falls under the CWE-693 weakness category, specifically addressing protection mechanism failures in web browser security implementations. The issue manifests when browsers incorrectly process and display security warnings, potentially allowing malicious actors to manipulate user trust mechanisms through deceptive visual presentation techniques. SmartScreen Filter serves as a crucial security layer designed to warn users about potentially malicious websites and downloads, making this vulnerability particularly dangerous as it undermines fundamental browser security controls.
The technical implementation flaw occurs within the browser's rendering engine where the SmartScreen Filter interface fails to properly validate or sanitize visual elements during security warning display. Attackers can exploit this weakness by crafting specially formatted web content that appears to originate from legitimate sources while actually containing malicious payloads. The vulnerability stems from insufficient input validation and improper security boundary enforcement within the browser's security warning subsystem. This allows threat actors to manipulate the visual presentation of security warnings, making them appear trustworthy while concealing malicious intent. The flaw operates at the intersection of user interface security and web content rendering, creating a pathway for social engineering attacks that bypass traditional security measures.
The operational impact of this vulnerability extends beyond simple browser exploitation, creating opportunities for sophisticated phishing campaigns and credential theft operations. Security researchers have documented how attackers leverage this weakness to create convincing fake security warnings that trick users into revealing sensitive information or downloading malware. The vulnerability affects multiple Microsoft browser versions including Internet Explorer and Edge, making it particularly dangerous in enterprise environments where these browsers are widely deployed. Organizations may experience increased incident response costs due to the difficulty in detecting these attacks, as they appear to originate from legitimate security systems rather than malicious sources. This vulnerability directly impacts the CIA triad by compromising both confidentiality and integrity, as users may unknowingly interact with malicious content while believing they are protected by security warnings.
Mitigation strategies for CVE-2017-0231 require immediate patch deployment through Microsoft's regular security updates, with particular emphasis on prioritizing updates for Internet Explorer and Edge browsers. Organizations should implement network-level monitoring to detect unusual patterns in SmartScreen Filter usage and consider disabling unnecessary SmartScreen functionality in controlled environments. Security teams must also enhance user awareness training to recognize potential spoofing attempts, as this vulnerability specifically targets user trust mechanisms rather than technical system vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1566 for credential access and T1059 for command and scripting interpreter, highlighting the multi-stage attack potential. Additionally, implementing browser security extensions and maintaining up-to-date security tooling can provide additional defense layers, while regular security assessments should specifically target browser rendering and security warning mechanisms to identify similar vulnerabilities in other components.