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8.2
CVE-2023-43652: Non-MFA account takeover via using only SSH public key to login in jumpserver
CVE-2023-43652 · published 3 years ago
Summary
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 ...
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| fit2cloud | jumpserver |
>= 2.0.0, < 2.28.20 >= 3.0.0, < 3.7.1 cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:* |
Original advisory text
Non-MFA account takeover via using only SSH public key to login in jumpserver
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.
References
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43652... Vendor Advisory
- https://github.com/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9 Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-43652 Vendor Advisory
- https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-int... Third Party Advisory
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker partial control
Severity
8.2
High
Type
CWE-862Missing Authorization
Timeline
Published27 Sep 2023
Updated4 Nov 2026
First seen29 Sep 2026
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