Headline
CVE-2022-46179: Authentication bypass via env vars
LiuOS is a small Python project meant to imitate the functions of a regular operating system. Version 0.1.0 and prior of LiuOS allow an attacker to set the GITHUB_ACTIONS environment variable to anything other than null or true and skip authentication checks. This issue is patched in the latest commit (c658b4f3e57258acf5f6207a90c2f2169698ae22) by requiring the var to be set to true, causing a test script to run instead of being able to login. A potential workaround is to check for the GITHUB_ACTIONS environment variable and set it to “” (no quotes) to null the variable and force credential checks.
Package
core.py (LiuOS Authentication)
Description
Impact
This affects all users of LiuOS as it allows an attacker to set the GITHUB_ACTIONS environment variable to anything other than null or true and skip authentication checks.
Patches
Patched in the latest commit by requiring the var to be set to true, causing a test script to run instead of being able to login.
Workarounds
Check for the GITHUB_ACTIONS environment variable and set it to “” (no quotes) to null the variable and force credential checks.
PoC
https://youtu.be/laVghrsG-A4