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GHSA-9xgj-fcgf-x6mw
No affected components available
Observation
When handling dependencies that come from a Git repository instead of a registry, Poetry uses various commands, such as git clone. These commands are being constructed using user input (e.g. the repository URL). When building the commands, Poetry correctly avoids Command Injection vulnerabilities by passing an array of arguments instead of a command string. However, there is the possibility that a user input starts with a dash (-) and is therefore treated as an optional argument instead of a positional one. This can lead to Code Execution because some of the commands have options that can be leveraged to run arbitrary executables.
To clone a repository, Poetry builds a git clone command, but fails to validate or sanitize the repository location properly:
def clone(self, repository: str, dest: Path) -> str:
return self.run("clone", "--recurse-submodules", repository, str(dest))
Since this value comes from the pyproject.toml file, it can contain any character, including a leading dash.
Impact
This vulnerability can lead to Arbitrary Code Execution, which would lead to the takeover of the system. If a developer is exploited, the attacker could steal credentials or persist their access. If the exploit happens on a server, the attackers could use their access to attack other internal systems. Since this vulnerability requires a fair amount of user interaction, it is not as dangerous as a remotely exploitable one. However, it still puts developers at risk when dealing with untrusted files in a way they think is safe, because the exploit still works when the victim tries to make sure nothing can happen, e.g. by vetting any Git or Poetry config files that might be present in the directory. This kind of attack vector has been used in the past to target security researchers by sending them projects to collaborate on, so we believe that there is a non-negligible risk.
Patches
1.1.8 || 1.2.0b1
Remediation
Upgrade to version 1.1.9 || 1.2.0b1
References
For more information
If you have any questions or comments about this advisory, email us at security@python-poetry.org
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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