// For flags

CVE-2023-42818

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

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

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.

JumpServer es un host de bastionado de código abierto. Cuando los usuarios habilitan MFA y usan una clave pública para la autenticación, el servidor Koko SSH no verifica la clave privada SSH correspondiente. Un atacante podría aprovechar la vulnerabilidad utilizando una clave pública revelada para intentar la autenticación de fuerza bruta contra el servicio SSH. Este problema se solucionó en las versiones 3.6.5 y 3.5.6. Se recomienda a los usuarios que actualicen. No se conocen workarounds para este problema.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
Poc
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-09-14 CVE Reserved
  • 2023-09-27 CVE Published
  • 2024-09-23 CVE Updated
  • 2024-09-23 First Exploit
  • 2024-10-29 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-287: Improper Authentication
  • CWE-307: Improper Restriction of Excessive Authentication Attempts
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Fit2cloud
Search vendor "Fit2cloud"
 Jumpserver
Search vendor "Fit2cloud" for product "Jumpserver"
 < 3.5.6
Search vendor "Fit2cloud" for product "Jumpserver" and version " < 3.5.6"
-
Affected
Fit2cloud
Search vendor "Fit2cloud"
 Jumpserver
Search vendor "Fit2cloud" for product "Jumpserver"
 >= 3.6.0 < 3.6.5
Search vendor "Fit2cloud" for product "Jumpserver" and version " >= 3.6.0 < 3.6.5"
-
Affected