Generate malicious files using recently published bidi-attack (CVE-2021-42574)

Overview

CVE-2021-42574 - Code generator

Generate malicious files using recently published bidi-attack vulnerability, which was discovered in Unicode Specification and affects many interpreters / compilers.

Cite from cve.mitre.org:

An issue was discovered in the Bidirectional Algorithm in the Unicode Specification through 14.0. It permits the visual reordering of characters via control sequences, which can be used to craft source code that renders different logic than the logical ordering of tokens ingested by compilers and interpreters. Adversaries can leverage this to encode source code for compilers accepting Unicode such that targeted vulnerabilities are introduced invisibly to human reviewers.

See the report about the Bidirectional Algorithm from unicode.org:
https://www.unicode.org/reports/tr9/tr9-42.html

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

Usage

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

arg long arg param description
-h --help none show this help message and exit
-i --infile INFILE Input file (template) containing unicode placeholders
-o --outfile OUTFILE Output file to store the final code
-u --uctable none Supported bidi-related characters
-a --about none Print about text

Examples

All examples are taken 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 templates

To create own templates, set placeholders (python3 codegen.py -u) where you want the special characters to appear. See the examples to have a first impression on how a template could look like.

The following table (taken from the original Camebridge report) shows the characters which are currently supported by this script. Supported Unicode Characters ~ https://www.trojansource.codes/trojan-source.pdf

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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