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Flask-AppBuilder vulnerable to incorrect authentication when using auth type OpenID

Critical severity GitHub Reviewed Published Feb 28, 2024 in dpgaspar/Flask-AppBuilder • Updated Mar 4, 2024

Package

pip Flask-AppBuilder (pip)

Affected versions

< 4.3.11

Patched versions

4.3.11

Description

Impact

When Flask-AppBuilder is set to AUTH_TYPE AUTH_OID, allows an attacker to forge an HTTP request, that could deceive the backend into using any requested OpenID service. This vulnerability could grant an attacker unauthorised privilege access if a custom OpenID service is deployed by the attacker and accessible by the backend.

This vulnerability is only exploitable when the application is using the old (deprecated 10 years ago) OpenID 2.0 authorization protocol (which is very different from the popular OIDC - Open ID Connect - popular protocol used today). Currently, this protocol is regarded as legacy, with significantly reduced usage and not supported for several years by major authorization providers.

Patches

Upgrade to Flask-AppBuilder 4.3.11

Workarounds

If upgrade is not possible add the following to your config:

from flask import flash, redirect
from flask_appbuilder import expose
from flask_appbuilder.security.sqla.manager import SecurityManager
from flask_appbuilder.security.views import AuthOIDView
from flask_appbuilder.security.forms import LoginForm_oid

basedir = os.path.abspath(os.path.dirname(__file__))


class FixedOIDView(AuthOIDView):
    @expose("/login/", methods=["GET", "POST"])
    def login(self, flag=True):
        form = LoginForm_oid()
        if form.validate_on_submit():
            identity_url = None
            for provider in self.appbuilder.sm.openid_providers:
                if provider.get("url") == form.openid.data:
                    identity_url = form.openid.data
            if identity_url is None:
                flash(self.invalid_login_message, "warning")
                return redirect(self.appbuilder.get_url_for_login)
        return super().login(flag=flag)

class FixedSecurityManager(SecurityManager):
    authoidview = FixedOIDView


FAB_SECURITY_MANAGER_CLASS = "config.FixedSecurityManager"

References

@dpgaspar dpgaspar published to dpgaspar/Flask-AppBuilder Feb 28, 2024
Published to the GitHub Advisory Database Feb 28, 2024
Reviewed Feb 28, 2024
Published by the National Vulnerability Database Feb 29, 2024
Last updated Mar 4, 2024

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

0.043%
(10th percentile)

Weaknesses

CVE ID

CVE-2024-25128

GHSA ID

GHSA-j2pw-vp55-fqqj

Credits

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