#VU61662 Race condition in Paramiko - CVE-2022-24302

Vulnerability identifier: #VU61662

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-24302

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Paramiko
Client/Desktop applications / Encryption software

Vendor: Jeff Forcier

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a race condition in the write_private_key_file() function between creation and chmod operations. A local user can exploit the race and gain unauthorized access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Paramiko: 2.0 - 2.10.0

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External links
http://www.paramiko.org/changelog.html
http://github.com/paramiko/paramiko/blob/363a28d94cada17f012c1604a3c99c71a2bda003/paramiko/pkey.py#L546
http://lists.debian.org/debian-lts-announce/2022/03/msg00032.html
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U63MJ2VOLLQ35R7CYNREUHSXYLWNPVSB/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LUEUEGILZ7MQXRSUF5VMMO4SWJQVPTQL/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TPMKRUS4HO3P7NR7P4Y6CLHB4MBEE3AI/

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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.