CVE-2022-42919: High severity Python Python vulnerability
Last updated 24 July 2024
Other sources
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.abstractsocketssupported 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/pypy3to a version that resolves this vulnerability.Fixed in 7.3.11+dfsg-2+deb12u3Fixed in 7.3.19+dfsg-1 - Upgrade
Upgrade
debian/python2.7to a version that resolves this vulnerability.Fixed in 2.7.18-8+deb11u1 - Upgrade
Upgrade
debian/python3.11to a version that resolves this vulnerability.Fixed in 3.11.2-6+deb12u5Fixed in 3.11.2-6+deb12u3 - Upgrade
Upgrade
debian/python3.9to a version that resolves this vulnerability.Fixed in 3.9.2-1+deb11u3 - Upgrade
Upgrade
CPythonto a version that resolves this vulnerability.Fixed in 3.9.16 - Upgrade
Upgrade
CPythonto a version that resolves this vulnerability.Fixed in 3.10.9 - Configuration
On Linux, set multiprocessing.util.abstract_sockets_supported to False as a workaround.
Python multiprocessing multiprocessing.util.abstract_sockets_supported = False - Compensating control
Use the multiprocessing start method other than 'forkserver' on Linux, since the forkserver start method is not the default and contributes to the risk.
Event History
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID of this issue is CVE-2022-42919.
What is the severity of CVE-2022-42919?
The severity of CVE-2022-42919 is high (7.8).
Which versions of Python are affected by CVE-2022-42919?
Python versions 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux are affected by CVE-2022-42919.
What is the impact of CVE-2022-42919?
CVE-2022-42919 allows local privilege escalation in a non-default configuration on Linux.
How can I fix CVE-2022-42919?
To fix CVE-2022-42919, upgrade your Python installation to version 3.9.16 or 3.10.9.