Very grateful to the original PoC author Qualys Research Team
Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.
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Install git, then clone the script from the github repository:
sudo apt install git -y git clone https://github.com/asepsaepdin/CVE-2021-3156.git
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Compile the PoC using command:
make
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Run the PoC using command:
./exploit