CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
21.5%
When resolving a program, Python/Windows look for the current working directory, and after that the PATH environment (see big warning in https://docs.python.org/3/library/subprocess.html#popen-constructor). 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.
The execution of the git
command happens in
And there are other commands executed that should probably be aware of this problem.
On a Windows system, create a git.exe
or git
executable in any directory, and import or run GitPython from that directory
python -c "import git"
The git executable from the current directory will be run.
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.
C:\\Program Files\\Git\\cmd\\git.EXE
(default git path installation).GIT_PYTHON_GIT_EXECUTABLE
environment variable on Windows systems.GIT_PYTHON_GIT_EXECUTABLE
env var to an absolute path.PATH
environment variable (suggested by @Byron)> [!NOTE]
> This vulnerability was reported via email, and it was decided to publish it here and make it public, so the community is aware of it, and a fix can be provided.
docs.python.org/3/library/subprocess.html#popen-constructor
github.com/gitpython-developers/GitPython
github.com/gitpython-developers/GitPython/commit/8b75434e2c8a082cdeb4971cc6f0ee2bafec45bc
github.com/gitpython-developers/GitPython/issues/1635
github.com/gitpython-developers/GitPython/pull/1636
github.com/gitpython-developers/GitPython/releases/tag/3.1.33
github.com/gitpython-developers/GitPython/security/advisories/GHSA-wfm5-v35h-vwf4
github.com/pypa/advisory-database/tree/main/vulns/gitpython/PYSEC-2023-161.yaml
nvd.nist.gov/vuln/detail/CVE-2023-40590