漏洞信息
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Vulnerability Title
Himmelblau: Authentication Bypass via Cross-User Local Session Impersonation in Device Authorization Grant (DAG) Flow
Vulnerability Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 2.0.0 to before 3.1.5 and 2.3.11, Himmelblau contained an authentication bypass vulnerability in the Device Authorization Grant (DAG) flow that allowed a user within the same Entra ID domain to obtain a local Unix session as another user by providing their own valid credentials. The vulnerability existed in the token_validate function, which validated domain aliases for legitimate multi-domain scenarios but failed to verify that the local part (username) of the authenticated user's UPN matched the requested account username. The function only compared domains, not the complete usernames. This vulnerability is fixed in 3.1.5 and 2.3.11.
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Vulnerability Type
授权机制不正确
Vulnerability Title
Himmelblau 安全漏洞
Vulnerability Description
Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 2.0.0版本至3.1.5之前版本和2.3.11之前版本存在安全漏洞,该漏洞源于token_validate函数验证域别名时未验证用户UPN的本地部分与请求账户用户名是否匹配,可能导致同一Entra ID域内的用户通过提供自己的有效凭据获得另一个用户的本地Unix会话。
CVSS Information
N/A
Vulnerability Type
N/A