Auth bypass in Fit2cloud Jumpserver
CVE-2023-42442
JumpServer is an open source bastion host and a professional operation and maintenance security audit system. Starting in version 3.0.0 and prior to versions 3.5.5 and 3.6.4, session replays can download without authentication. Session replays stored in S3, OSS, or other cloud storage are not affected. The api `/api/v1/terminal/sessions/` permission control is broken and can be accessed anonymously. SessionViewSet permission classes set to `[RBACPermission | IsSessionAssignee]`, relation is or, so any permission matched will be allowed. Versions 3.5.5 and 3.6.4 have a fix. After upgrading, visit the api `$HOST/api/v1/terminal/sessions/?limit=1`. The expected http response code is 401 (`not_authenticated`).
Vulnerability class: Broken Authentication
EPSS: 0.559 (99.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
- Fit2cloud Jumpserver
- Jumpserver — versions >= 3.0.0, < 3.5.5, >= 3.6.0, < 3.6.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-42442?
- CVE-2023-42442 is a high-severity vulnerability in Fit2cloud Jumpserver, classified under Improper Authentication. CVSS score: 8.2/10. Published 2023-09-15.
- How severe is CVE-2023-42442?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2023-42442 known to be exploited?
- 44 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.