Private-key disclosure via delayed file permission change
Published Mar 17, 2022 · Updated Dec 16, 2025
Race condition in Paramiko before 2.10.1 allows attackers to read private keys while newly created files retain permissive default modes. PKey.write_private_key_file created each private-key file before applying mode 0600, leaving its contents exposed under the process's default permissions. Exploitation requires knowledge of the target path and winning the race before chmod; the bounded consequence is unauthorized reading of a newly written private key.
Summary
What happened
Race condition in Paramiko before 2.10.1 allows attackers to read private keys while newly created files retain permissive default modes. PKey.write_private_key_file created each private-key file before applying mode 0600, leaving its contents exposed under the process's default permissions. Exploitation requires knowledge of the target path and winning the race before chmod; the bounded consequence is unauthorized reading of a newly written private key.
The record
- CVE
- CVE-2022-24302
- Published
- Mar 17, 2022
- Updated
- Dec 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-362, T1552.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 17, 2022CVE publishedPublication date reported by the CVE source.
- Dec 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Attacks
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Technologies
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