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The vulnerability exists within the Windows Remote Access Connection Manager (RasMan) service due to improper access control enforcement. A locally authenticated, low-privileged attacker can exploit a race condition during a specific service operation. By creating a symbolic link at a targeted file path at the precise moment the service, which runs with SYSTEM privileges, attempts to perform an action, the attacker can redirect the service to overwrite or create a file in an arbitrary location. This manipulation of the file system allows the attacker to write a malicious DLL to a privileged directory. Once the fake DLL is in place, the attacker can force a system process to load it, thereby executing their code with NT AUTHORITY\SYSTEM level permissions and achieving a full local privilege escalation.
Platform: Windows
Version: Multiple versions
Vulnerability: Privilege Escalation
Severity: High
date: 2024-07-09
Prediction: 2024-07-23
What Undercode Say:
icacls C:\Windows\System32 mklink /H C:\temp\fake.dll C:\target\file.dll sc query RasMan tasklist /SVC | findstr RasMan
// Code to create symlink and trigger race condition
include <windows.h>
include <iostream>
int main() {
while (true) {
CreateSymbolicLinkA("C:\Windows\System32\rasapi32.dll", "C:\temp\malicious.dll", 0);
// Trigger RasMan operation
}
}
How Exploit:
Race condition attack.
Symbolic link exploitation.
Abusing service permissions.
DLL hijacking technique.
Protection from this CVE
Apply Windows update.
Restrict user permissions.
Monitor symbolic link creation.
Disable unnecessary services.
Impact:
Full system compromise.
Local privilege escalation.
Bypass security controls.
Arbitrary code execution.
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Sources:
Reported By: www.cve.org
Extra Source Hub:
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