CVE-2023-6507

NameCVE-2023-6507
DescriptionAn 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`).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python2.7 (PTS)buster2.7.16-2+deb10u1fixed
buster (security)2.7.16-2+deb10u4fixed
bullseye2.7.18-8+deb11u1fixed
python3.11 (PTS)bookworm3.11.2-6fixed
sid, trixie3.11.9-1fixed
python3.12 (PTS)sid, trixie3.12.4-1fixed
python3.7 (PTS)buster3.7.3-2+deb10u3fixed
buster (security)3.7.3-2+deb10u7fixed
python3.9 (PTS)bullseye3.9.2-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python2.7source(unstable)(not affected)
python3.10source(unstable)(not affected)
python3.11source(unstable)(not affected)
python3.12source(unstable)3.12.1-1
python3.7source(unstable)(not affected)
python3.9source(unstable)(not affected)

Notes

- python3.11 <not-affected> (Vulnerable code not present)
- python3.10 <not-affected> (Vulnerable code not present)
- python3.9 <not-affected> (Vulnerable code not present)
- python3.7 <not-affected> (Vulnerable code not present)
- python2.7 <not-affected> (Vulnerable code not present)
https://mail.python.org/archives/list/security-announce@python.org/thread/AUL7QFHBLILGISS7U63B47AYSSGJJQZD/
https://github.com/python/cpython/issues/112334
https://github.com/python/cpython/pull/112617

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