Executive Summary

This vulnerability exists in NovumOS versions prior to 0.24, where Syscall 15 (MemoryMapRange) allows user-mode processes (Ring 3) to map arbitrary virtual address ranges into their address space without proper validation.

Because the system does not check if these ranges include forbidden regions such as critical kernel structures (IDT, GDT, TSS, and page tables), a local attacker can exploit this to modify kernel interrupt handlers.

This leads to privilege escalation, allowing a user-mode process to gain kernel-level privileges.

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Impact Analysis

The vulnerability allows a local attacker to escalate privileges from user mode to kernel mode by modifying kernel interrupt handlers.

This can lead to unauthorized access to sensitive system resources, bypassing security controls, and potentially compromising the entire system's integrity.

Because the attacker gains kernel-level privileges, they can execute arbitrary code with the highest system permissions.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade NovumOS to version 0.24 or later, where the issue with Syscall 15 (MemoryMapRange) has been fixed.

Until the upgrade is applied, restrict local user access to prevent exploitation of the vulnerability, as it requires local user privileges.

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