Auth bypass in Fit2cloud Jumpserver
CVE-2023-42818
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.
Vulnerability class: Broken Authentication
EPSS: 0.006 (45.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.
Affected products
- Fit2cloud Jumpserver
- Jumpserver — versions >= 3.6.0, < 3.6.5, < 3.5.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-42818?
- CVE-2023-42818 is a medium-severity vulnerability in Fit2cloud Jumpserver, classified under Improper Authentication. CVSS score: 5.4/10. Published 2023-09-27.
- How severe is CVE-2023-42818?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2023-42818 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.