CVE-2023-40590

GitPython is a python library used to interact with Git repositories. When
resolving a program, Python/Windows look for the current working directory,
and after that the PATH environment. GitPython defaults to use the git
command, if a user runs GitPython from a repo has a git.exe or git
executable, that program will be run instead of the one in the user’s
PATH. This is more of a problem on how Python interacts with Windows
systems, Linux and any other OS aren’t affected by this. But probably
people using GitPython usually run it from the CWD of a repo. An attacker
can trick a user to download a repository with a malicious git
executable, if the user runs/imports GitPython from that directory, it
allows the attacker to run any arbitrary commands. There is no fix
currently available for windows users, however there are a few mitigations.
1: Default to an absolute path for the git program on Windows, like
C:\\Program Files\\Git\\cmd\\git.EXE (default git path installation). 2:
Require users to set the GIT_PYTHON_GIT_EXECUTABLE environment variable
on Windows systems. 3: Make this problem prominent in the documentation and
advise users to never run GitPython from an untrusted repo, or set the
GIT_PYTHON_GIT_EXECUTABLE env var to an absolute path. 4: Resolve the
executable manually by only looking into the PATH environment variable.

Notes