SB2023102388 - Improper Authentication in JumpServer

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Main Vulnerability Database SB2023102388

SB2023102388 - Improper Authentication in JumpServer

Published: October 23, 2023 Updated: April 27, 2026

Security Bulletin ID SB2023102388
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Authentication (CVE-ID: CVE-2023-42818)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to brute-force MFA codes.

The vulnerability exists due to improper authentication enforcement in the Koko SSH server authentication flow when handling non-compliant SSH authentication method sequences. A remote attacker can use a specially crafted SSH client to brute-force MFA codes.

The issue can be triggered by first querying public key usability with a publickey authentication request and then invoking the keyboard-interactive method.


Remediation

Install update from vendor's website.

References