CVE-2010-3325 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 6 through 8 does not properly handle unspecified special characters in Cascading Style Sheets (CSS) documents, which allows remote attackers to obtain sensitive information from a different (1) domain or (2) zone via a crafted web site, aka "CSS Special Character Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 09/26/2021
The vulnerability identified as CVE-2010-3325 represents a critical information disclosure flaw in Microsoft Internet Explorer versions 6 through 8 that stems from improper handling of special characters within Cascading Style Sheets documents. This weakness allows remote attackers to extract sensitive data from different domains or security zones through maliciously crafted websites, creating a significant security risk for users operating these older browser versions. The vulnerability specifically manifests when Internet Explorer processes CSS documents containing unspecified special characters, leading to unexpected behavior that can expose confidential information across domain boundaries.
The technical root cause of this vulnerability lies in the browser's insufficient validation and processing of CSS special characters, particularly when these characters are used in conjunction with cross-domain requests or zone boundaries. When Internet Explorer encounters certain malformed CSS content, it fails to properly isolate or sanitize the data processing, potentially allowing information leakage between different security contexts. This flaw operates at the rendering engine level where CSS parsing intersects with security boundary enforcement, creating a pathway for attackers to exploit the browser's handling of malformed content to extract sensitive data from other domains or security zones.
The operational impact of this vulnerability extends beyond simple information disclosure, as it fundamentally compromises the security model that Internet Explorer employs to separate different domains and security zones. Attackers can leverage this weakness to construct malicious websites that, when loaded in vulnerable browsers, can access and potentially exfiltrate information from other domains or zones that should normally be protected by browser security mechanisms. This creates a serious risk for enterprise environments where users may browse untrusted websites while maintaining active sessions with sensitive corporate resources, as the vulnerability could enable cross-domain data leakage that bypasses standard security controls.
From a cybersecurity perspective, this vulnerability aligns with CWE-200, which addresses "Information Exposure," and demonstrates characteristics consistent with ATT&CK technique T1071.004 for application layer protocols and T1566 for social engineering. The vulnerability exploits the trust relationships between different security zones in Internet Explorer, making it particularly dangerous in enterprise environments where users may navigate between different security contexts. Organizations running these vulnerable browser versions face increased risk of data breaches, credential theft, and lateral movement attacks that could compromise entire network infrastructures.
Mitigation strategies for CVE-2010-3325 require immediate action to address the underlying browser vulnerability through patching and security updates. Microsoft has released security updates to resolve this issue, and organizations must ensure all affected systems receive these patches promptly. Additionally, network administrators should implement web filtering solutions that can detect and block malicious CSS content, while security teams should monitor for exploitation attempts targeting this vulnerability. Browser hardening measures including disabling unnecessary CSS features and implementing strict content security policies can provide additional defense layers. Given that Internet Explorer 6 through 8 are no longer supported, organizations should prioritize migrating to modern browser versions that have robust security controls against similar vulnerabilities. The vulnerability also highlights the importance of regular security assessments and vulnerability management programs to identify and remediate similar issues before they can be exploited in real-world scenarios.