CVE-2011-2005 is a high-severity vulnerability that allows local users to gain elevated privileges on affected Microsoft Windows systems. Specifically, the flaw resides in the Ancillary Function Driver (afd.sys), which fails to properly validate user-mode input passed to kernel mode. This oversight can be exploited through a crafted application, making it a significant risk for organizations still using these outdated systems.
The vulnerability has been assigned a CVSS score of 7.8, classified as high severity. The implications of this vulnerability are serious, as it allows unauthorized access to system resources and can lead to further exploitation if not addressed promptly. Organizations are urged to take immediate action, as local users could leverage this vulnerability for unauthorized privilege escalation.
As of now, there are confirmed exploits available for this vulnerability, which only heightens the urgency for organizations to implement the necessary patches. Failure to do so could result in significant risks to the integrity and security of their systems.
Organizations should prioritize patching systems affected by CVE-2011-2005 immediately to mitigate potential threats. Given the nature of this vulnerability, it is critical to ensure that appropriate updates are applied to safeguard against possible exploitation.
Vulnerability Details
The vulnerability is characterized as an elevation of privilege issue, specifically within the Ancillary Function Driver (afd.sys) of Microsoft Windows XP SP2, SP3, and Windows Server 2003 SP2. The official description states that the driver does not properly validate user-mode input passed to kernel mode, allowing local users to gain privileges via a crafted application. This vulnerability was first published on October 12, 2011.
The CVSS 3.1 base score for this vulnerability is 7.8, indicating a high severity level. The attack vector is local, with low complexity required for exploitation, meaning that local users can initiate an attack with minimal effort. Additionally, the vulnerability requires user interaction, which may limit its exploitation to some extent.
The confidentiality, integrity, and availability impacts of this vulnerability are all rated as high, underscoring the serious nature of potential exploitation. Organizations using vulnerable versions of Windows must address this issue promptly.
Technical Analysis
The root cause of CVE-2011-2005 lies in the failure of afd.sys to validate input correctly, allowing crafted applications to bypass security restrictions. The attack vector is local, meaning that an attacker must have physical access to the system to exploit this vulnerability. The attack complexity is low, indicating that successful exploitation does not require advanced skills or resources.
The privilege required for exploitation is none, as local users can execute the attack without needing any additional permissions. User interaction is required, which means that the attacker must convince the user to run the malicious application.
The potential impacts of this vulnerability on confidentiality, integrity, and availability are all rated as high. Successful exploitation could lead to unauthorized access to sensitive information, modifications of critical system data, and disruptions in service availability.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2011-2005 is significant, particularly for organizations that continue to utilize unsupported versions of Microsoft Windows. The vulnerability presents a substantial attack surface for local users, increasing the likelihood of successful exploitation.
The implications for organizations include potential unauthorized access to sensitive data, the compromise of system integrity, and operational disruptions. The blast radius is extensive due to the local nature of the attack, as multiple users on a single system could be targeted.
Given the CVSS score of 7.8 and its inclusion in the KEV catalog, organizations should prioritize remediation efforts. Immediate patching is essential to mitigate the high risks posed by this vulnerability.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft products are affected by CVE-2011-2005:
1. Microsoft Windows XP SP2
2. Microsoft Windows XP SP3
3. Microsoft Windows Server 2003 SP2
Organizations using these versions should consider applying patches or upgrading to mitigate risks associated with this vulnerability.
Mitigation & Remediation
Organizations should apply updates as per the vendor's instructions to mitigate CVE-2011-2005. The required action includes ensuring that all affected systems are patched to the latest versions. In addition, organizations may consider implementing configuration hardening practices to further reduce attack surfaces.
If immediate patching is not feasible, organizations can implement network controls to restrict access to vulnerable systems. Continuous monitoring of affected environments is also recommended to detect any signs of exploitation.
Continuous penetration testing can help identify vulnerabilities in existing systems and validate the effectiveness of implemented controls.
Detection Guidance
To detect potential exploitation of CVE-2011-2005, organizations should monitor system logs for unusual activities, particularly those related to application executions. Behavioral anomalies, such as unauthorized privilege escalations or unexpected application behaviors, should be flagged for investigation.
Network signatures related to the exploitation attempts of this vulnerability should also be established to enhance detection capabilities. System changes, particularly those initiated by local users, should be closely monitored to identify any suspicious activity.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2011-2005 extends beyond immediate patching needs. This vulnerability represents a pattern where outdated software continues to pose risks to organizations, especially those that have not transitioned to supported operating systems. Security teams should learn from such vulnerabilities to ensure proactive measures are in place.
Organizations are encouraged to develop a comprehensive vulnerability management program to continuously address such risks and to ensure timely updates and patches are applied.
Furthermore, the incident highlights the necessity of aligning security strategies with development practices to avoid similar vulnerabilities in future releases. Regular assessments and updates to security postures are critical to safeguarding organizations against evolving threats.
For insights on how to enhance your security testing, organizations can refer to the following resources:
Penetration testing methodology offers best practices for identifying and mitigating vulnerabilities effectively.
Vulnerability management program design provides a framework for organizations to manage and remediate vulnerabilities systematically.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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