CVE-2023-45805 – pdm

Package

Manager: pip
Name: pdm
Vulnerable Version: >=0 <=2.9.3

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.0011 pctl0.29971

Details

PDM Trojan Lockfile ### Summary It's possible to craft a malicious `pdm.lock` file that could allow e.g. an insider or a malicious open source project to appear to depend on a trusted PyPI project, but actually install another project. ### Details Project `foo` can be targeted by creating the project `foo-2` and uploading the file `foo-2-2.tar.gz` to pypi.org. PyPI will see this as project `foo-2` version `2`, while PDM will see this as project `foo` version `2-2`. The version must only be [parseable as a version](https://github.com/frostming/unearth/blob/eca170d9370ac5032f2e497ee9b1b63823d3fe0f/src/unearth/evaluator.py#L215-L229) (and the filename must be a prefix of the project name), but it's [not verified to match the version being installed](https://github.com/pdm-project/pdm/blob/45d1dfa47d4900c14a31b9bb761e4c46eb5c9442/src/pdm/models/candidates.py#L98-L99). (Version `2-2` is also not a valid [normalized version per PEP 440](https://peps.python.org/pep-0440/#post-release-spelling).) Matching the project name exactly (not just prefix) would fix the issue. The version should also be verified to avoid version downgrade attacks. ### PoC Example `pdm.lock` snippet to appear to depend on `foo` but actually install `foo-2` ``` "foo 2.2.0" = [ url = "https://files.pythonhosted.org/.../foo-2-2.tar.gz ] ``` ### Impact When installing dependencies with PDM, what's actually installed could differ from what's listed in `pyproject.toml` (including arbitrary code execution on install). It could also be used for downgrade attacks by only changing the version.

Metadata

Created: 2023-10-20T19:30:23Z
Modified: 2023-10-20T22:59:02Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/10/GHSA-j44v-mmf2-xvm9/GHSA-j44v-mmf2-xvm9.json
CWE IDs: ["CWE-20"]
Alternative ID: GHSA-j44v-mmf2-xvm9
Finding: F184
Auto approve: 1