Auth bypass in Ovh The-Bastion
CVE-2023-45140
The Bastion provides authentication, authorization, traceability and auditability for SSH accesses. SCP and SFTP plugins don't honor group-based JIT MFA. Establishing a SCP/SFTP connection through The Bastion via a group access where MFA is enforced does not ask for additional factor. This abnormal behavior only applies to per-group-based JIT MFA. Other MFA setup types, such as Immediate MFA, JIT MFA on a per-plugin basis and JIT MFA on a per-account basis are not affected. This issue has been patched in version 3.14.15.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Ovh The-Bastion — versions >= 3.0.0, <= 3.14.0
Weakness classification (CWE)
References
- github.com/ovh/the-bastion/security/advisories/GHSA-pr4q-w883-pf5x (Mitigation, Vendor Advisory)
- github.com/ovh/the-bastion/releases/tag/v3.14.15 (Patch)
Frequently asked questions
- What is CVE-2023-45140?
- CVE-2023-45140 is a medium-severity vulnerability in Ovh The-Bastion, classified under Missing Authentication for Critical Function. CVSS score: 4.8/10. Published 2023-11-08.
- How severe is CVE-2023-45140?
- Medium severity. CVSS v3 base score is 4.8 out of 10.