CVE-2014-2926 in Virtual System Administrator
Summary
by MITRE
kapfa.sys in Kaseya Virtual System Administrator (VSA) 6.5 before 6.5.0.17 and 7.0 before 7.0.0.16 allows local users to cause a denial of service (NULL pointer dereference and application crash) via unspecified vectors.
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Analysis
by VulDB Data Team • 08/20/2024
The vulnerability identified as CVE-2014-2926 affects the kapfa.sys kernel driver component within Kaseya Virtual System Administrator (VSA) software versions 6.5 before 6.5.0.17 and 7.0 before 7.0.0.16. This represents a critical local privilege escalation issue that stems from improper input validation within the kernel-mode driver responsible for system administration functions. The vulnerability manifests as a NULL pointer dereference condition that occurs when the driver processes malformed or unexpected input parameters, leading to an application crash and subsequent denial of service. The affected driver operates at the kernel level, making it particularly dangerous as local users with minimal privileges can exploit this weakness to disrupt system operations.
The technical flaw resides in the kapfa.sys driver's failure to properly validate input parameters before dereferencing pointers during routine system administration operations. This type of vulnerability falls under the CWE-476 category of NULL Pointer Dereference, which represents a common class of software defects where applications attempt to access memory locations through null pointers without proper validation. The vulnerability's exploitation requires local system access, meaning any user with legitimate login credentials can potentially trigger the crash condition. This weakness operates at the kernel level, bypassing typical user-mode security controls and making it particularly challenging to detect and prevent through conventional means.
The operational impact of this vulnerability extends beyond simple denial of service, as it can disrupt critical system administration functions within Kaseya VSA environments. When the driver crashes, it can cause the entire VSA application to become unresponsive, potentially affecting remote system monitoring and management capabilities that organizations rely upon for IT infrastructure maintenance. The vulnerability particularly impacts enterprise environments where Kaseya VSA is used for centralized system administration, as the crash can propagate throughout the managed network and affect multiple systems simultaneously. Organizations using this software for critical infrastructure management face significant operational risk when this vulnerability remains unpatched.
Mitigation strategies for CVE-2014-2926 should prioritize immediate patch deployment from Kaseya, specifically targeting the updated versions 6.5.0.17 and 7.0.0.16 which contain the necessary driver fixes. System administrators should implement comprehensive monitoring to detect potential exploitation attempts and establish baseline system behavior for anomaly detection. The vulnerability's classification aligns with ATT&CK technique T1068 which covers Local Privilege Escalation, and organizations should consider implementing additional security controls such as kernel-mode driver whitelisting and mandatory access controls. Regular security assessments of kernel drivers and system administration tools should be conducted to identify similar weaknesses, as this vulnerability demonstrates the importance of proper input validation in privileged system components. Network segmentation and principle of least privilege should also be enforced to limit potential lateral movement if exploitation occurs.