CVE-2023-45140

Group-based JIT MFA bypass on scp and sftp in The Bastion

CVSS 4.8 MEDIUMEPSS 0.4%CWE-306

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.8EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

08 Nov 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

ovh · the-bastion

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References

https://github.com/ovh/the-bastion/releases/tag/v3.14.15 https://github.com/ovh/the-bastion/security/advisories/GHSA-pr4q-w883-pf5x