CVE-2022-24302

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-03-17 · updated 2026-06-17
Weakness: CWE-362

Description

In Paramiko before 2.10.1, a race condition (between creation and chmod) in the write_private_key_file function could allow unauthorized information disclosure.

Affected products

Debian Linux: 9.0, 10.0
Fedoraproject Fedora: 34, 35, 36
Paramiko: before 2.10.1 — fixed in 2.10.1
Pypi Paramiko: before 2.9.3; from 2.10.0 before 2.10.1; 0.1-bulbasaur, 0.1-charmander, 0.9-doduo, 0.9-eevee, 0.9-fearow, 0.9-gyarados (+121) — fixed in 2.9.3, 2.10.1

How to fix

Upgrade to a fixed version: Paramiko 2.10.1; Pypi Paramiko 2.9.3, 2.10.1. Check the vendor advisory for mitigations.

References

https://github.com/paramiko/paramiko/blob/363a28d94cada17f012c1604a3c99c71a2bda003/paramiko/pkey.py#L546
https://lists.debian.org/debian-lts-announce/2022/03/msg00032.html
https://lists.debian.org/debian-lts-announce/2022/09/msg00013.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LUEUEGILZ7MQXRSUF5VMMO4SWJQVPTQL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TPMKRUS4HO3P7NR7P4Y6CLHB4MBEE3AI/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U63MJ2VOLLQ35R7CYNREUHSXYLWNPVSB/
https://www.paramiko.org/changelog.html
https://github.com/paramiko/paramiko/blob/363a28d94cada17f012c1604a3c99c71a2bda003/paramiko/pkey.py#L546
https://lists.debian.org/debian-lts-announce/2022/03/msg00032.html
https://lists.debian.org/debian-lts-announce/2022/09/msg00013.html
https://lists.debian.org/debian-lts-announce/2025/12/msg00020.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LUEUEGILZ7MQXRSUF5VMMO4SWJQVPTQL/

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