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CVE-2023-42818

SSH public key login without private key challenge if mfa is enabled in jumpserver

Published: Sep 27, 2023Updated: Mar 25, 2025 Sources: CVE List NVD BDUCWE-287
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.6%
Top 56.8%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-287CWE-307

Affected Products

jumpserverfit2cloud
SaaSWeb App
Cloud & SaaS
JumpServerHangzhou Feizhiyun Information Technology Co., Ltd.
On-prem
Security Products / identity-access-mgmt
jumpserverjumpserver
Mixed
Security Products / identity-access-mgmt
fit2cloudcommercialCloud & SaaSaka jumpserver, 1panel, cloudexplorer lite
hangzhou feizhiyun information technology co., ltd.commercialSecurity Productsaka jumpserver
jumpserveross-projectSecurity Productsaka jumpserver.org, jumpserver

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

3 techniques
Credential Access
Initial Access
View detailed technique mapping

References

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv
github.com
https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2
sonarsource.com

Timeline

Published
Sep 27, 2023
Last Updated
Mar 25, 2025

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