CVE-2011-3402 is a high-severity vulnerability found in the TrueType font parsing engine within win32k.sys of Microsoft Windows. This flaw impacts various Windows operating systems, including Windows XP, Windows Vista, Windows 7, and Windows Server editions. Attackers can exploit this vulnerability to execute arbitrary code by leveraging crafted font data present in Word documents or web pages. This vulnerability was notably exploited in the wild by the Duqu malware in November 2011.
The CVSS score of 8.8 indicates a high risk to organizations, as it allows for remote code execution without requiring elevated privileges. The attack vector is network-based, and the exploitation complexity is low, making this a significant threat to systems that have not been patched.
Given the nature of this vulnerability and its exploitation history, organizations should prioritize patching immediately. The potential impact includes unauthorized access, data compromise, and system integrity loss.
As of now, there are no known public exploits available for this vulnerability, but its inclusion in the Known Exploited Vulnerabilities (KEV) catalog highlights its relevance and urgency for remediation.
Vulnerability Details
The vulnerability allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page. It is classified as a high severity vulnerability with a CVSS score of 8.8. The affected products include Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, as well as Windows 7 Gold and SP1.
Technical Analysis
The root cause of CVE-2011-3402 stems from the vulnerability in the TrueType font parsing engine, which fails to properly handle crafted font data. This oversight allows a remote attacker to craft a malicious font file that, when processed by an affected system, can lead to code execution.
The attack vector is primarily network-based, requiring user interaction to execute the crafted document or web page. The attack complexity is low, necessitating no special privileges for exploitation. The vulnerability impacts confidentiality, integrity, and availability at high levels, posing a substantial risk.
Risk & Impact Analysis
The risk to organizations includes unauthorized code execution, leading to potential data breaches, system control loss, and widespread network compromise. With a CVSS score of 8.8, the urgency for addressing this vulnerability is critical, especially given its historical exploitation in the wild. The blast radius is significant, particularly for organizations still using unsupported or outdated versions of Microsoft Windows.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft Windows are affected by CVE-2011-3402: Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, R2 SP1, and Windows 7 Gold and SP1. Organizations should consider all versions prior to vendor patch vulnerable.
Mitigation & Remediation
To mitigate the risks associated with CVE-2011-3402, organizations should apply the latest patches from Microsoft. Ensure systems are updated to versions that have addressed this vulnerability. If patches are not available, consider implementing configuration hardening measures, limiting user permissions, and employing network controls to restrict access to potentially malicious documents.
Regular security assessments are essential for identifying and mitigating vulnerabilities. For effective assessment, organizations can utilize our penetration testing services to validate the effectiveness of applied patches and configurations.
Detection Guidance
Monitoring for abnormal behavior related to document handling, such as unexpected crashes or unauthorized access attempts, is crucial. Log indicators from affected systems can provide valuable insights into potential exploitation attempts. Organizations should also be aware of any changes in system performance or configuration that may indicate a compromise.
AppSecure Threat Intelligence Insight
CVE-2011-3402 represents a significant example of how legacy vulnerabilities can have long-lasting impacts, especially as they relate to remote code execution. Security teams must prioritize regular updates and vulnerability management to prevent such threats from being exploited. Organizations should also enhance their vulnerability management programs to identify and address weaknesses proactively.
This incident also suggests the importance of understanding attack vectors associated with document processing. Organizations should consider training staff on secure document handling practices and employing advanced threat detection mechanisms to mitigate risks.
Finally, as this CVE shows, maintaining a secure environment requires continuous vigilance and adaptation to emerging threats. For further reading on best practices, consider our insights on penetration testing methodologies to enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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