Summary
Seclore FileSecure Desktop Client contains an improper access control vulnerability in its kernel-mode driver that can allow an authenticated local user to obtain NT AUTHORITY\SYSTEM privileges.
The issue becomes risky when a local account can interact with the affected driver in a way that bypasses intended authorization boundaries.
Affected context
The vulnerability occurs in the kernel-mode driver component of Seclore FileSecure Desktop Client on affected systems. It may be present when the driver exposes privileged operations without sufficiently restricting which authenticated local users can invoke them.
Exploit preconditions
- Attack surface: The locally installed kernel-mode driver
- Required access: An authenticated local user account on an affected system
- Trigger point: Interaction with a privileged driver operation
- Why exploitation is possible: Authorization checks may not adequately distinguish permitted users from untrusted local accounts, allowing access to operations performed with SYSTEM-level privileges
Why this happens
The underlying issue is an authorization failure in a privileged kernel component. The driver performs security-sensitive actions without reliably enforcing the intended caller permissions, allowing a lower-privileged authenticated user to cross a local privilege boundary.
This behavior maps to CWE-269: Improper Privilege Management, where privileged functionality is exposed or maintained without appropriate access control.
Potential impact
- A local attacker may execute code with NT AUTHORITY\SYSTEM privileges
- The attacker could bypass operating system security boundaries
- Sensitive files, credentials, or protected application data could be accessed
- The compromised host could be used for persistence, defense evasion, or lateral movement
General mitigation guidance
Mitigation generally focuses on reducing exposure of privileged driver functionality and enforcing authorization at every security-sensitive entry point.
Common defensive patterns include:
- Restricting driver operations to explicitly authorized callers
- Validating caller identity and privilege at the kernel boundary
- Applying least privilege to services, users, and supporting components
- Minimizing the number of privileged operations exposed by the driver
- Using secure-by-default driver interfaces and defensive input validation
- Preventing untrusted local users from modifying or replacing driver-related files and services
- Monitoring and controlling installation or loading of kernel-mode components
How teams detect issues like this
Organizations can look for this class of issue through:
- Static analysis of driver entry points and IOCTL handlers for missing or inconsistent authorization checks
- Code review signals such as privileged operations that rely only on authentication or caller-supplied identifiers
- Tests that exercise driver interfaces under standard-user and restricted-token contexts
- Endpoint policy monitoring for unexpected driver access, service changes, or privilege transitions
- Security assessments that verify every privileged operation has an explicit caller authorization decision
Automated code-scanning and review tools may help identify suspicious privilege-boundary patterns, but kernel-specific testing remains important.
