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December 2023

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[CVE-2023-6507] Groups not dropped before running subprocess when using empty 'extra_groups' parameter
by Seth Larson 08 Dec '23

08 Dec '23

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. It's recommended that if you are affected to upgrade to the latest CPython 3.12.1. *Affected usages:* 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:* - CVE: https://www.cve.org/CVERecord?id=CVE-2023-6507 - Patch: https://github.com/python/cpython/pull/112617 - Issue: https://github.com/python/cpython/issues/112334

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