PSF-2023-12

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Import Source
https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2023-12.json
JSON Data
https://api.osv.dev/v1/vulns/PSF-2023-12
Aliases
Published
2023-12-08T18:20:49.583Z
Modified
2024-06-14T20:17:36.361549Z
Summary
Groups not dropped before running subprocess when using empty 'extra_groups' parameter
Details

An issue was found in CPython 3.12.0 subprocess module on POSIX platforms. The issue was fixed in CPython 3.12.1 and does not affect other stable releases.

When using the extra_groups= parameter with an empty list as a value (ie extra_groups=[]) the logic regressed to not call setgroups(0, NULL) before calling exec(), thus not dropping the original processes' groups before starting the new process. There is no issue when the parameter isn't used or when any value is used besides an empty list.

This issue only impacts CPython processes run with sufficient privilege to make the setgroups system call (typically root).

References

Affected packages

Git / github.com/python/cpython

Affected versions

v3.*

v3.12.0
v3.12.0a5
v3.12.0a6
v3.12.0a7
v3.12.0b1
v3.12.0b2
v3.12.0b3
v3.12.0b4
v3.12.0rc1
v3.12.0rc2
v3.12.0rc3
v3.13.0a1
v3.13.0a2