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CVE-2023-42818— SSH public key login without private key challenge if mfa is enabled in jumpserver

Quick assessment

Affected
jumpserver jumpserver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.4 · Medium EPSS 0.58% · P45

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2023-42818

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Vendor Advisories for CVE-2023-42818 (1)

Security Blog Posts for CVE-2023-42818 (1)

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
Same vendor: jumpserver
Same weakness: CWE-287

V. Comments for CVE-2023-42818

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