CVE-2023-43652 json
Non-MFA account takeover via using only SSH public key to login in jumpserver
published 2023-09-27 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-48043
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
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 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.
Patch / fix
- jumpserver jumpserver 2.28.20, 3.7.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- jumpserver jumpserver
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9
exploit, vendor-advisory
-
sonarsource.com
/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2
technical-description
Sources
- CVE List CVE-2023-43652
- NVD CVE-2023-43652
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