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CVE-2023-45140— Group-based JIT MFA bypass on scp and sftp in The Bastion

Quick assessment

Affected
ovh the-bastion
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bastion是一组机器，用作操作团队的唯一入口点，以安全地连接到设备。 Bastion 3.0.0 到3.14.0版本存在访问控制错误漏洞，该漏洞源于 MFA 的组或个人可以强制通过 Bastion 建立 SCP/SFTP 连接不需要额外因素， SSH 访问不受影响。

CVSS 4.8 · Medium EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2023-45140

Vulnerability Information
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Vulnerability Title
Group-based JIT MFA bypass on scp and sftp in The Bastion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Bastion 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bastion是一组机器，用作操作团队的唯一入口点，以安全地连接到设备。 Bastion 3.0.0 到3.14.0版本存在访问控制错误漏洞，该漏洞源于 MFA 的组或个人可以强制通过 Bastion 建立 SCP/SFTP 连接不需要额外因素， SSH 访问不受影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ovh the-bastion >= 3.0.0, <= 3.14.0 -

II. Public POCs for CVE-2023-45140

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III. Intelligence Information for CVE-2023-45140

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Vendor Advisories for CVE-2023-45140 (1)

Other References for CVE-2023-45140 (1)

IV. Related Vulnerabilities

Same product: the-bastion
Same vendor: ovh
Same weakness: CWE-306

V. Comments for CVE-2023-45140

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