[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
setuptools (changelog)	>=83.0.0, <83.1.0 → >=84.1.0, <84.2.0

---

setuptools: Windows path escape via namespace_packages.txt during legacy wheel installation Description

GHSA-xmj3-9gf7-h52w

More information

Details

Summary

On Windows, attacker-controlled content in a wheel's
.dist-info/namespace_packages.txt can cause setuptools' legacy wheel
installation path to create an __init__.py outside the requested
destination_eggdir.

The attacker can influence the destination path, but not the contents of
the created file.

Details

Tested setuptools commit:

6ead555c5fb29bc57fe6105b1bffc163f56fd558

Relevant source:

setuptools/wheel.py

SHA-256:

359b7e0d5dd8c3135653abe08a8ed5dc0352eadfd7df22cb5e2b5303b7c3cafd

The relevant call path is:

Wheel(wheel_path).install_as_egg(destination)
→ _install_as_egg
→ _convert_metadata
→ _fix_namespace_packages

A wheel can provide attacker-controlled content in:

<distribution>.dist-info/namespace_packages.txt

The namespace value is eventually used approximately as:

mod_dir = os.path.join(destination_eggdir, *mod.split('.'))
mod_init = os.path.join(mod_dir, '__init__.py')

If mod is a Windows drive-qualified absolute path containing no dots,
mod.split('.') preserves it as a single component.
On Windows, os.path.join(destination_eggdir, absolute_component) discards
the original base directory and resolves to the attacker-supplied absolute
path.
The existing wheel filename and ZIP traversal checks do not validate this
metadata value before it is subsequently interpreted as a filesystem path.

```markdown

##### PoC

The reproduction was performed entirely inside a disposable temporary
directory.

Layout:

```text
sandbox/
    destination/
    outside/
    input/
    canary.txt

A synthetic wheel was created containing:

demo_pkg-1.0.dist-info/namespace_packages.txt

whose content was the absolute path of:

sandbox\outside

The real acquired setuptools implementation was then invoked:

setuptools.wheel.Wheel(synthetic_wheel).install_as_egg(
    sandbox_destination
)

The operation completed without exception.

Expected metadata was created under:

sandbox\destination\EGG-INFO

but setuptools also created:

sandbox\outside\__init__.py

The file did not exist before execution.

Its contents were:

__import__('pkg_resources').declare_namespace(__name__)

The unrelated canary remained byte-identical.

The sandbox was deleted after recording the evidence.

##### Impact

A crafted wheel can cause setuptools to create a fixed-content
`__init__.py` outside the intended installation directory at a
filesystem path influenced by the wheel, with the permissions of the
process performing the installation.

The demonstrated reproduction required the target parent directory to
already exist.

#### Severity
- CVSS Score: 1.0 / 10 (Low)
- Vector String: `CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N`

#### References
- [https://github.com/pypa/setuptools/security/advisories/GHSA-xmj3-9gf7-h52w](https://redirect.github.com/pypa/setuptools/security/advisories/GHSA-xmj3-9gf7-h52w)
- [https://github.com/pypa/setuptools/pull/5329](https://redirect.github.com/pypa/setuptools/pull/5329)
- [https://github.com/pypa/setuptools/commit/6d07b8d17890dda58d944ac51e58f54af92d52af](https://redirect.github.com/pypa/setuptools/commit/6d07b8d17890dda58d944ac51e58f54af92d52af)
- [https://github.com/pypa/setuptools](https://redirect.github.com/pypa/setuptools)
- [https://github.com/pypa/setuptools/releases/tag/v84.1.0](https://redirect.github.com/pypa/setuptools/releases/tag/v84.1.0)

This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-xmj3-9gf7-h52w) and the [GitHub Advisory Database](https://redirect.github.com/github/advisory-database) ([CC-BY 4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>pypa/setuptools (setuptools)</summary>

### [`v84.1.0`](https://redirect.github.com/pypa/setuptools/compare/v84.0.0...v84.1.0)

[Compare Source](https://redirect.github.com/pypa/setuptools/compare/v84.0.0...v84.1.0)

### [`v84.0.0`](https://redirect.github.com/pypa/setuptools/compare/v83.0.0...v84.0.0)

[Compare Source](https://redirect.github.com/pypa/setuptools/compare/v83.0.0...v84.0.0)

</details>

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (5c14153) to head (674a908).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #282   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files         110      110           
  Lines        4963     4963           
=======================================
  Hits         4847     4847           
  Misses        116      116           

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