Generate malicious files using recently published homoglyphic-attack (CVE-2021-42694)

Overview

CVE-2021-42694

Generate malicious files using recently published homoglyph-attack vulnerability, which was discovered at least in C, C++, C#, Go, Python, Rust, JS, ...

Cite from cve.mitre.org

An issue was discovered in the character definitions of the Unicode Specification through 14.0. The specification allows an adversary to produce source code identifiers such as function names using homoglyphs that render visually identical to a target identifier. Adversaries can leverage this to inject code via adversarial identifier definitions in upstream software dependencies invoked deceptively in downstream software.

Raw data for homoglyphs (homoglyphs.txt) taken from here and cleaned data to sort out italic and dissimilar characters.

See the original source from Camebridge University:
https://www.trojansource.codes/trojan-source.pdf

Usage

python3 codegen.py [-h] [-i INFILE] [-o OUTFILE] [-r] [-a]

arg long arg param descrption
-h --help none show this help message and exit
-i --infile INFILE Input file containing homoglyph placeholders
-o --outfile OUTFILE Output file to store the final code
-r -random none SET flag to choose random homoglyph; take first one if not set
-a --about none Print about text

Examples

Examples were created by me or are takem from the referenced PDF. To run these examples, execute codegen.py with the required arguments:

python3 codegen.py -i infile.xyz -o outfile.xyz and run/compile outfile.xyz.

Create own template

Currently are only digits [0-9], as well as lower- and uppercase characters [a-zA-Z] supported. To replace a supported char within your template with a (random) homoglyph, simply enclose the char with dollar signs $. See the examples to have a first impression on how a template could look like.

Owner
js-on
Cyber sec student from Germany, in love with music, the nature and programming (python, nim, c++, ...)
js-on
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