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CVE-2022-42919

Published: 2 November 2022

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.

Priority

High

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
python2.7
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Does not exist

mantic Does not exist

trusty Not vulnerable

upstream Not vulnerable

xenial Not vulnerable

python3.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy
Released (3.10.6-1~22.04.1)
kinetic
Released (3.10.7-1ubuntu0.1)
lunar Does not exist

mantic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

Patches:
upstream: https://github.com/python/cpython/commit/eae692eed18892309bcc25a2c0f8980038305ea2

python3.11
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Not vulnerable
(3.11.0-3)
mantic Not vulnerable
(3.11.0-3)
trusty Does not exist

upstream Needs triage

xenial Does not exist

python3.4
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Not vulnerable

upstream Needs triage

xenial Does not exist

python3.5
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Not vulnerable

upstream Needs triage

xenial Not vulnerable

python3.6
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Not vulnerable

xenial Does not exist

python3.7
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Does not exist

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Not vulnerable

xenial Does not exist

python3.8
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Not vulnerable

xenial Does not exist

python3.9
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (3.9.5-3ubuntu0~20.04.1+esm1)
Available with Ubuntu Pro
jammy Does not exist

kinetic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

Patches:

upstream: https://github.com/python/cpython/commit/b43496c01a554cf41ae654a0379efae18609ad39

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H