CVE-2023-43652: Non-MFA account takeover via using only SSH public key to login in jumpserver
First published: Wed Sep 27 2023(Updated: )
JumpServer is an open source bastion host. As an unauthenticated user, it is possible to authenticate to the core API with a username and an SSH public key without needing a password or the corresponding SSH private key. An SSH public key should be considered public knowledge and should not used as an authentication secret alone. JumpServer provides an API for the KoKo component to validate user private key logins. This API does not verify the source of requests and will generate a personal authentication token. Given that public keys can be easily leaked, an attacker can exploit the leaked public key and username to authenticate, subsequently gaining access to the current user's information and authorized actions. This issue has been addressed in versions 2.28.20 and 3.7.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Fit2cloud Jumpserver | >=2.0.0<2.28.20 | |
| Fit2cloud Jumpserver | >=3.0.0<3.7.1 |
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Frequently Asked Questions
What is CVE-2023-43652?
CVE-2023-43652 is a vulnerability in the Fit2cloud Jumpserver software that allows unauthenticated users to authenticate to the core API without needing a password or SSH private key.
How does CVE-2023-43652 affect Fit2cloud Jumpserver?
CVE-2023-43652 affects Fit2cloud Jumpserver versions 2.0.0 to 2.28.20 and versions 3.0.0 to 3.7.1, allowing unauthenticated users to bypass authentication.
What is the severity of CVE-2023-43652?
The severity of CVE-2023-43652 is classified as critical with a CVSS score of 9.1.
How can I mitigate the vulnerability CVE-2023-43652 in Fit2cloud Jumpserver?
To mitigate the vulnerability, it is recommended to update Fit2cloud Jumpserver to a version higher than 2.28.20 or 3.7.1.
Where can I find more information about CVE-2023-43652?
You can find more information about CVE-2023-43652 at the following URL: https://github.com/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9
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- version/fit2cloud jumpserver/2.0.0
- version/fit2cloud jumpserver/3.0.0