CVE-2023-6507

Groups not dropped before running subprocess when using empty 'extra_groups' parameter

Description

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`).

Scores

Faiblesses (CWE)

• CWE-269

Références européennes

• ENISA EUVD · EUVD-2023-58738
• GCVE · GCVE-0-2023-6507

Configurations affectées (CPE NVD)

• cpe:2.3:a:python:python:3.12.0:-:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.13.0:alpha1:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.13.0:alpha2:*:*:*:*:*:*

Produits affectés

Références

• https://github.com/python/cpython/issues/112334
• https://mail.python.org/archives/list/security-announce@python.org/thread/AUL7QFHBLILGISS7U63B47AYSSGJJQZD/
• https://github.com/python/cpython/commit/9fe7655c6ce0b8e9adc229daf681b6d30e6b1610
• https://github.com/python/cpython/commit/10e9bb13b8dcaa414645b9bd10718d8f7179e82b
• https://github.com/python/cpython/commit/85bbfa8a4bbdbb61a3a84fbd7cb29a4096ab8a06

Sources