CVE-2023-42818— SSH public key login without private key challenge if mfa is enabled in jumpserver
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I. Basic Information for CVE-2023-42818
Vulnerability Information
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Vulnerability Title
SSH public key login without private key challenge if mfa is enabled in jumpserver
Source: NVD (National Vulnerability Database)
Vulnerability Description
JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Jumpserver 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jumpserver是中国杭州飞致云信息科技有限公司的一款开源堡垒机。 JumpServer 存在授权问题漏洞，该漏洞源于当用户启用MFA并使用公钥进行身份验证时，Koko SSH服务器不会验证相应的SSH私钥。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jumpserver | jumpserver | >= 3.6.0, < 3.6.5 | - |
II. Public POCs for CVE-2023-42818
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · jumpserver · 2023-09-27 · 4 CVEs total
| CVE-2023-43651 | 8.6 HIGH | Remote code execution on the host system via MongoDB shell in jumpserver |
| CVE-2023-43652 | 8.2 HIGH | Non-MFA account takeover via using only SSH public key to login in jumpserver |
| CVE-2023-43650 | 8.2 HIGH | Non-MFA account takeover via brute-force attack on weak password reset code in jumpserver |
IV. Related Vulnerabilities
Same product: jumpserver
- CVE-2026-31864
JumpServer has a Server-Side Template Injection Leading to R - CVE-2026-31798
JumpServer Improper Certificate Validation in Custom SMS API - CVE-2025-58044
JumpServer has an Open Redirect Vulnerability - CVE-2025-62795
JumpServer Unauthorized LDAP Configuration Access via WebSoc - CVE-2025-62712
JumpServer Connection Token Leak Vulnerability
Same vendor: jumpserver
- CVE-2026-31864
JumpServer has a Server-Side Template Injection Leading to R - CVE-2026-31798
JumpServer Improper Certificate Validation in Custom SMS API - CVE-2025-58044
JumpServer has an Open Redirect Vulnerability - CVE-2025-62795
JumpServer Unauthorized LDAP Configuration Access via WebSoc - CVE-2025-62712
JumpServer Connection Token Leak Vulnerability
Same weakness: CWE-287
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V. Comments for CVE-2023-42818
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