CVE-2016-0099 is a high-severity vulnerability affecting the Secondary Logon Service in various Microsoft Windows versions, including Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012, Windows RT 8.1, and Windows 10. The vulnerability arises from improper processing of request handles, allowing local users to gain privileges through a crafted application, thus posing a significant risk to system integrity.
The CVSS score for this vulnerability is 7.8, indicating a high level of severity. Its impact is notably severe, as it can lead to unauthorized administrative access on affected systems. Organizations must prioritize addressing this vulnerability to mitigate potential exploitation.
Currently, this vulnerability is actively exploited in the wild, as indicated by its inclusion in the Known Exploited Vulnerabilities catalog. Organizations should take immediate action to apply available patches and updates.
Organizations should prioritize patching immediately. The risk to organizations includes unauthorized access and control over sensitive systems, which could lead to data breaches and further exploitation.
Vulnerability Details
The Secondary Logon Service in Microsoft Windows does not properly manage request handles, allowing local users to gain elevated privileges. This vulnerability is classified as a privilege escalation issue, specifically denoted as "CWE-120." The publication date of the CVE is March 9, 2016.
Technical Analysis
The root cause of CVE-2016-0099 lies in the improper handling of request handles by the Secondary Logon Service. The attack vector is local, requiring low complexity, with only low privileges needed for exploitation. User interaction is not required, making it easier for attackers to leverage this vulnerability.
Successful exploitation of this vulnerability could lead to high impacts on confidentiality, integrity, and availability of affected systems, as attackers may execute arbitrary code with administrative privileges.
Risk & Impact Analysis
Organizations using the affected Microsoft Windows versions face significant risks, particularly those with sensitive data or critical infrastructure. The blast radius could be extensive, as local access could lead to system-wide compromises.
The urgency for remediation is critical, given the high CVSS score and active exploitation of this vulnerability. Organizations should implement recommended patches and monitor for any signs of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
The vulnerable Microsoft Windows versions include:
Windows 10 (1507 and 1511), Windows 7 (SP1), Windows 8.1, Windows Server 2008 (SP2), Windows Server 2012, and Windows Vista (SP2). Organizations should ensure updates are applied to all affected systems.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the updates provided by Microsoft as outlined in their advisory. Affected users should upgrade to the latest versions of Windows to ensure that they are protected against this vulnerability.
If immediate patching is not possible, organizations should implement strict access controls and monitor for any suspicious activity that could indicate exploitation of this vulnerability.
Additional guidance on security best practices can be found through our penetration testing compliance guide to enhance overall security posture.
Detection Guidance
Organizations should monitor logs for unusual access patterns, especially attempts to access administrative functions by lower-privileged accounts. Behavioral anomalies that deviate from normal usage patterns should also be analyzed for potential exploitation.
AppSecure Threat Intelligence Insight
CVE-2016-0099 highlights a critical need for organizations to maintain updated security measures and awareness of vulnerabilities that can be exploited in local environments.
As threat actors continue to leverage privilege escalation vulnerabilities, security teams must adopt proactive measures to safeguard their systems. For detailed methodologies on penetration testing, refer to our penetration testing methodology and the importance of continuous security testing.
Additionally, understanding the trends in ransomware targeting can provide insights into potential vulnerabilities, as seen in our discussion on ransomware attack statistics for 2025.
Lastly, organizations should assess their security frameworks in line with modern threats, which is discussed in our cloud security assessment guide to ensure robust defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)