CVE-2022-42919

 

Published at: - 07-11-2022 01:15

Last modified: - 18-01-2023 02:15

Total changes: - 13

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://github.com/python/cpython/issues/97514
• FEDORA-2022-028c09eaa7-
• FEDORA-2022-1166a1df1e-
• FEDORA-2022-b17bf30e88-
• FEDORA-2022-462f39dd2f-
• FEDORA-2022-a7cad6bd22-
• FEDORA-2022-f44dd1bec2-
• https://security.netapp.com/advisory/ntap-20221209-0006/
• https://github.com/python/cpython/issues/97514#issuecomment-1310277840
• FEDORA-2023-af5206f71d-
• FEDORA-2023-097dd40685-
• https://github.com/python/cpython/compare/v3.10.8...v3.10.9
• https://github.com/python/cpython/compare/v3.9.15...v3.9.16

 

Keywords

NVD

 

CVE-2022-42919

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures