False negative: missing os.exec* APIs with `sh -c` as sink in py/code-injection.
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 55/100
Research direction
Start with the py/code-injection query and compare its existing os.system and subprocess.run(shell=True) sink handling with the reported os.execl example. Run the minimal example and equivalent variants, then verify that tainted commands passed through sh -c are reported while the existing controls remain covered.
Written by the indexing model from the issue text.
Description
Description of the issue
py/code-injection flags command injection when the code uses os.system(...) or subprocess.run(..., shell=True), but it does not flag the same tainted command when it is executed through Python os.exec* APIs with sh -c.
A minimal example:
files = request.args.get("files", "")
os.execl("/bin/sh", "sh", "-c", "ls " + files)
I also tested equivalent variants (os.execlp, os.execve, and subprocess.run(["sh","-c", ...])) and they were not reported either, while the os.system and shell=True controls were reported.
Sink pattern example in the wild:
https://github.com/ziyan/ssh-otp/blob/ad23edded03ee7d198417d99457d3cfa3df814d1/ssh-otp#L90
There are also code using `python -c
https://github.com/davidfraser/dbghelper/blob/f12b91b468bb640f1cb9d19733afef7696eee9fa/dbg.py#L47
- Dominant language
- CodeQL
- Stars
- 10.1k
- Forks
- 2.1k
- Avg merge
- 2d 10h
- Merged PRs (30d)
- 134
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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