Vulnerability Description
Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. Pickles can execute arbitrary code. Thus, this allows for local user privilege escalation to the user that any forkserver process is running as. Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start method for multiprocessing is not the default start method. This issue is Linux specific because only Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract namespace sockets by default. Support for users manually specifying an abstract namespace socket was added as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do that in CPython before 3.9.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Python | >= 3.7.3, <= 3.7.15 |
| Fedoraproject | Fedora | 35 |
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/compare/v3.10.8...v3.10.9Release Notes
- https://github.com/python/cpython/compare/v3.9.15...v3.9.16Release Notes
- https://github.com/python/cpython/issues/97514Third Party Advisory
- https://github.com/python/cpython/issues/97514#issuecomment-1310277840Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202305-02
- https://security.netapp.com/advisory/ntap-20221209-0006/Third Party Advisory
- https://github.com/python/cpython/compare/v3.10.8...v3.10.9Release Notes
FAQ
What is CVE-2022-42919?
CVE-2022-42919 is a vulnerability with a CVSS score of 7.8 (HIGH). Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-default configuration. The Python multiprocessing library, when used with the forkserver start m...
How severe is CVE-2022-42919?
CVE-2022-42919 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-42919?
Check the references section above for vendor advisories and patch information. Affected products include: Python Python, Fedoraproject Fedora.