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
AI Score
Confidence
High
EPSS
Percentile
22.1%
pdm is a Python package and dependency manager supporting the latest PEP standards. 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. A 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
and the filename must be a prefix of the project name, but it’s not verified to match the version being installed. Version 2-2
is also not a valid normalized version per PEP 440. Matching the project name exactly (not just prefix) would fix the issue. 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. This issue has been addressed in commit 6853e2642df
which is included in release version 2.9.4
. Users are advised to upgrade. There are no known workarounds for this vulnerability.
github.com/frostming/unearth/blob/eca170d9370ac5032f2e497ee9b1b63823d3fe0f/src/unearth/evaluator.py#L215-L229
github.com/pdm-project/pdm/blob/45d1dfa47d4900c14a31b9bb761e4c46eb5c9442/src/pdm/models/candidates.py#L98-L99
github.com/pdm-project/pdm/commit/6853e2642dfa281d4a9958fbc6c95b7e32d84831
github.com/pdm-project/pdm/security/advisories/GHSA-j44v-mmf2-xvm9
peps.python.org/pep-0440/#post-release-spelling
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
AI Score
Confidence
High
EPSS
Percentile
22.1%