CVE-2023-42818
MEDIUMJumpServer < 3.5.6 - Improper Authentication via SSH Public Key Bypass
Title source: llmDescription
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.
References (2)
Core 2
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv
Various Sources x_refsource_misc
https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2
Scores
CVSS v3
5.4
EPSS
0.0058
EPSS Percentile
43.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-287
CWE-307
Status
published
Products (1)
fit2cloud/jumpserver
< 3.5.6
Published
Sep 27, 2023
Tracked Since
Feb 18, 2026