Privilege escalation in Python

1) Deserialization of Untrusted Data

EUVDB-ID: #VU69391

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-42919

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to 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.A local user can execute arbitrary code with privileges of the user running the any forkserver process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Python: 3.9.0b4 - 3.10.8

CPE2.3

• cpe:2.3:a:python_org:python:3.9.15:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.10.8:*:*:*:*:*:*:*

External links

http://github.com/python/cpython/issues/97514

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.