A tool to generate binary polyglots.
Loosely named after Μιθραδάτης, a famous polyglot.
Pronounced mɪtrə.
For example, mitra.py file1.png file2.dcm gives you a working PNG/DICOM polyglot.
It tries different layouts: Stacks (appended data), Cavities (blank space), Parasites (comments), Zippers (mutual comments).
It returns the offsets where the payloads 'switch sizes' for multi-ciphertexts.
Ex: Z(80-162-286)-DICOM^TIFF.be3b767b.dcm.tif is a DICOM/TIFF zipper
where the payloads switch side at offsets 0x80, 0x162 and 0x286.
The -s option extracts the 2 payloads separately, mixed with pseudo-random bytes.
Check Corkami mini or tiny PoCs for input files. and the formats repository for some extra technical info.
It doesn't support crypto-polyglots or any polyglots with overlapping bytes.
The goal of this project was to explore polyglots layouts, formats abuses, and understand which format features makes which kind of abuse possible.
You really don't need to understand a file format totally to abuse it:
in a chunk-based format, just find where to cut the file,
then wrap foreign data in a new chunk.
Delayed Magic at offset zero, No appended
Any offset Cavities start tolerated appended data data Footer
Z 7 A R J P P I D T P M A B B C E E F F G G I I I I J J N O P P R R T B J P P W I X
i Z r A a H D S I A S P r M z P B L L l I z C C D L P P E g E N I T I P a C C A D Z
p i j R v P F O C R 4 P i I M F V a F i C O 3 D 2 G S g G F F F G v A A S 3
p a O p O L c p v A F F a P P M v
S M 2 2 N 1
c G
Zip . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
7Zip X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
Arj X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
RAR X X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
JavaSc X X X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
PHP X X X X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
PDF X X X X X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 39
ISO X X X X X X X . X X X X X X X X X X X X X X X X X X X X X X X X X X X 34
DICOM X X X X X X X X . X X X X X X X X X X X X X X X X X X X X X 29
TAR X X X X X X X X . X X X X X X X X X X X X X X X X X X X X X 29
PS X X X X X X X X X X . X 11
MP4 X X X X X X X X X X X . 11
Ar X X X X X X X X X X . 10
BMP X X X X X X X X . 8
Bzip2 X X X X X X X X X . 9
CPIO X X X X X X X X X X . 10
EBML X X X X X X X X . 8
ELF X X X X X X X X . 8
FLV X X X X X X X X X X . 10
Flac X X X X X X X X X X . 10
GIF X X X X X X X X X . 9
Gzip X X X X X X X X X X . 10
ICC X X X X X X X X . 8
ICO X X X X X X X X X X . 10
ID3v2 X X X X X X X X X X . 10
ILDA X X X X X X X X X X . 10
JP2 X X X X X X X X X X . 10
JPG X X X X X X X X X X . 10
NES X X X X X X X X X . 9
Ogg X X X X X X X X X X . 10
PE X X X X X X X X X . 9
PNG X X X X X X X X X X . 10
RIFF X X X X X X X X X X . 10
RTF X X X X X X X X X X . 10
TIFF X X X X X X X X X X . 10
BPG X X X X X X X X . 8
Java X X X X X X X . 7
PCAP X X X X X X X X . 8
PCAPNG X X X X X X X X . 8
WASM X X X X X X X X . 8
ID3v1 . 0
XZ . 0
Filetypes combinations: 322
Notes that some formats are containers and apply to several file types.
OTOH some container-based types aren't supporting all features and
can't be abused like other formats using the same container:
for example, JUNK chunks in RIFF containers...