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CVE-2022-31027— Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator

Quick assessment

Affected
jupyterhub oauthenticator
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.

OAuthenticator是JupyerHub 登录处理程序的 OAuth 令牌库。 OAuthenticator 14.2.0 及之前版本存在安全漏洞，该漏洞源于CILogon 是一个联合身份验证提供程序，它允许用户通过多个身份提供程序 (IdP) 进行身份验证。

CVSS 4.2 · Medium EPSS 0.46% · P37
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I. Basic Information for CVE-2022-31027

Vulnerability Information
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Vulnerability Title
Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator
Source: CVE Program / CVE List V5
Vulnerability Description
OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is primarily used to restrict a JupyterHub only to users of a given institute. The allowed_idps configuration trait of CILogonOAuthenticator is documented to be a list of domains that indicate the institutions whose users are authorized to access this JupyterHub. This authorization is validated by ensuring that the *email* field provided to us by CILogon has a *domain* that matches one of the domains listed in `allowed_idps`.If `allowed_idps` contains `berkeley.edu`, you might expect only users with valid current credentials provided by University of California, Berkeley to be able to access the JupyterHub. However, CILogonOAuthenticator does *not* verify which provider is used by the user to login, only the email address provided. So a user can login with a GitHub account that has email set to `<something>@berkeley.edu`, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a *breaking change* in how `allowed_idps` is interpreted. It's no longer a list of domains, but configuration representing the `EntityID` of the IdPs that are allowed, picked from the [list maintained by CILogon](https://cilogon.org/idplist/). Users are advised to upgrade.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
OAuthenticator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OAuthenticator是JupyerHub 登录处理程序的 OAuth 令牌库。 OAuthenticator 14.2.0 及之前版本存在安全漏洞，该漏洞源于CILogon 是一个联合身份验证提供程序，它允许用户通过多个身份提供程序 (IdP) 进行身份验证。
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
jupyterhub oauthenticator < 15.0.0 -

II. Public POCs for CVE-2022-31027

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III. Intelligence Information for CVE-2022-31027

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Vendor Advisories for CVE-2022-31027 (1)

IV. Related Vulnerabilities

Same product: oauthenticator
Same vendor: jupyterhub
Same weakness: CWE-639

V. Comments for CVE-2022-31027

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