* providers/oauth2: fix CVE-2024-21637 (#8104) Signed-off-by: Jens Langhammer <jens@goauthentik.io> * update changelog Signed-off-by: Jens Langhammer <jens@goauthentik.io> --------- Signed-off-by: Jens Langhammer <jens@goauthentik.io> Co-authored-by: Jens L <jens@goauthentik.io>
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@ -85,6 +85,25 @@ class TestAuthorize(OAuthTestCase):
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)
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OAuthAuthorizationParams.from_request(request)
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def test_blocked_redirect_uri(self):
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"""test missing/invalid redirect URI"""
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OAuth2Provider.objects.create(
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name=generate_id(),
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client_id="test",
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authorization_flow=create_test_flow(),
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redirect_uris="data:local.invalid",
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)
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with self.assertRaises(RedirectUriError):
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request = self.factory.get(
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"/",
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data={
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"response_type": "code",
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"client_id": "test",
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"redirect_uri": "data:localhost",
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},
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)
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OAuthAuthorizationParams.from_request(request)
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def test_invalid_redirect_uri_empty(self):
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"""test missing/invalid redirect URI"""
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provider = OAuth2Provider.objects.create(
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@ -75,6 +75,7 @@ PLAN_CONTEXT_PARAMS = "goauthentik.io/providers/oauth2/params"
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SESSION_KEY_LAST_LOGIN_UID = "authentik/providers/oauth2/last_login_uid"
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ALLOWED_PROMPT_PARAMS = {PROMPT_NONE, PROMPT_CONSENT, PROMPT_LOGIN}
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FORBIDDEN_URI_SCHEMES = {"javascript", "data", "vbscript"}
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@dataclass(slots=True)
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@ -175,6 +176,10 @@ class OAuthAuthorizationParams:
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self.check_scope()
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self.check_nonce()
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self.check_code_challenge()
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if self.request:
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raise AuthorizeError(
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self.redirect_uri, "request_not_supported", self.grant_type, self.state
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)
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def check_redirect_uri(self):
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"""Redirect URI validation."""
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@ -212,10 +217,9 @@ class OAuthAuthorizationParams:
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expected=allowed_redirect_urls,
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)
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raise RedirectUriError(self.redirect_uri, allowed_redirect_urls)
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if self.request:
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raise AuthorizeError(
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self.redirect_uri, "request_not_supported", self.grant_type, self.state
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)
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# Check against forbidden schemes
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if urlparse(self.redirect_uri).scheme in FORBIDDEN_URI_SCHEMES:
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raise RedirectUriError(self.redirect_uri, allowed_redirect_urls)
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def check_scope(self):
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"""Ensure openid scope is set in Hybrid flows, or when requesting an id_token"""
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@ -6,6 +6,7 @@ from hashlib import sha256
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from re import error as RegexError
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from re import fullmatch
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from typing import Any, Optional
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from urllib.parse import urlparse
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from django.http import HttpRequest, HttpResponse
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from django.utils import timezone
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@ -54,6 +55,7 @@ from authentik.providers.oauth2.models import (
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RefreshToken,
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)
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from authentik.providers.oauth2.utils import TokenResponse, cors_allow, extract_client_auth
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from authentik.providers.oauth2.views.authorize import FORBIDDEN_URI_SCHEMES
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from authentik.sources.oauth.models import OAuthSource
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from authentik.stages.password.stage import PLAN_CONTEXT_METHOD, PLAN_CONTEXT_METHOD_ARGS
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@ -205,6 +207,10 @@ class TokenParams:
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).from_http(request)
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raise TokenError("invalid_client")
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# Check against forbidden schemes
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if urlparse(self.redirect_uri).scheme in FORBIDDEN_URI_SCHEMES:
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raise TokenError("invalid_request")
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self.authorization_code = AuthorizationCode.objects.filter(code=raw_code).first()
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if not self.authorization_code:
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LOGGER.warning("Code does not exist", code=raw_code)
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@ -137,6 +137,62 @@ helm upgrade authentik authentik/authentik -f values.yaml --version ^2023.10
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- web/admin: fix @change handler for ak-radio elements (#7348)
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- web/admin: fix role form reacting to enter (#7330)
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## Fixed in 2023.10.3
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- ci: explicitly give write permissions to packages (cherry-pick #7428) (#7430)
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- core: fix worker beat toggle inverted (cherry-pick #7508) (#7509)
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- events: fix gdpr compliance always running (cherry-pick #7491) (#7505)
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- providers/oauth2: set auth_via for token and other endpoints (cherry-pick #7417) (#7427)
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- providers/proxy: fix closed redis client (cherry-pick #7385) (#7429)
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- root: Improve multi arch Docker image build speed (cherry-pick #7355) (#7426)
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- sources/oauth: fix patreon (cherry-pick #7454) (#7456)
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- stages/email: fix duplicate querystring encoding (cherry-pick #7386) (#7425)
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- web: bugfix: broken backchannel selector (cherry-pick #7480) (#7507)
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- web/admin: fix html error on oauth2 provider page (cherry-pick #7384) (#7424)
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- web/flows: attempt to fix bitwareden android compatibility (cherry-pick #7455) (#7457)
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## Fixed in 2023.10.4
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- ci: fix permissions for release pipeline to publish binaries (cherry-pick #7512) (#7621)
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- core: bump golang from 1.21.3-bookworm to 1.21.4-bookworm (cherry-pick #7483) (#7622)
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- events: don't update internal service accounts unless needed (cherry-pick #7611) (#7640)
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- events: fix missing model\_\* events when not directly authenticated (cherry-pick #7588) (#7597)
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- events: sanitize functions (cherry-pick #7587) (#7589)
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- providers/proxy: Fix duplicate cookies when using file system store. (cherry-pick #7541) (#7544)
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- providers/scim: fix missing schemas attribute for User and Group (cherry-pick #7477) (#7596)
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- root: specify node and python versions in respective config files, deduplicate in CI (#7620)
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- security: fix [CVE-2023-48228](../../security/CVE-2023-48228.md), Reported by [@Sapd](https://github.com/Sapd) (#7666)
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- stages/email: use uuid for email confirmation token instead of username (cherry-pick #7581) (#7584)
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- web/admin: fix admins not able to delete MFA devices (#7660)
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## Fixed in 2023.10.5
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- blueprints: improve file change handler (cherry-pick #7813) (#7934)
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- events: add better fallback for sanitize_item to ensure everything can be saved as JSON (cherry-pick #7694) (#7937)
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- events: fix lint (#7700)
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- events: include user agent in events (cherry-pick #7693) (#7938)
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- providers/scim: change familyName default (cherry-pick #7904) (#7930)
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- root: don't show warning when app has no URLs to import (cherry-pick #7765) (#7935)
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- root: Fix cache related image build issues (cherry-pick #7831) (#7932)
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- stages/email: improve error handling for incorrect template syntax (cherry-pick #7758) (#7936)
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- tests: fix flaky tests (cherry-pick #7676) (#7939)
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- web: dark/light theme fixes (#7872)
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- web: fix overflow glitch on ak-page-header (cherry-pick #7883) (#7931)
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- web/admin: always show oidc well-known URL fields when they're set (#7560)
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- web/user: fix search not updating app (cherry-pick #7825) (#7933)
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## Fixed in 2023.10.6
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- core: fix PropertyMapping context not being available in request context
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- outposts: disable deployment and secret reconciler for embedded outpost in code instead of in config (cherry-pick #8021) (#8024)
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- outposts: fix Outpost reconcile not re-assigning managed attribute (cherry-pick #8014) (#8020)
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- providers/oauth2: fix [CVE-2024-21637](../../security/CVE-2024-21637.md), Reported by [@lauritzh](https://github.com/lauritzh) (#8104)
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- providers/oauth2: remember session_id from initial token (cherry-pick #7976) (#7977)
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- providers/proxy: use access token (cherry-pick #8022) (#8023)
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- rbac: fix error when looking up permissions for now uninstalled apps (cherry-pick #8068) (#8070)
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- sources/oauth: fix missing get_user_id for OIDC-like sources (Azure AD) (#7970)
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- web/flows: fix device picker incorrect foreground color (cherry-pick #8067) (#8069)
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## API Changes
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#### What's New
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@ -0,0 +1,39 @@
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# CVE-2024-21637
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_Reported by [@lauritzh](https://github.com/lauritzh)_
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## XSS in Authentik via JavaScript-URI as Redirect URI and form_post Response Mode
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### Summary
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Given an OAuth2 provider configured with allowed redirect URIs set to `*` or `.*`, an attacker can send an OAuth Authorization request using `response_mode=form_post` and setting `redirect_uri` to a malicious URI, to capture authentik's session token.
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### Patches
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authentik 2023.8.6 and 2023.10.6 fix this issue.
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### Impact
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The impact depends on the attack scenario. In the following I will describe the two scenario that were identified for Authentik.
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#### Redirect URI Misconfiguration
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While advising that this may cause security issues, Authentik generally allows wildcards as Redirect URI. Therefore, using a wildcard-only effectively allowing arbitrary URLS is possible misconfiguration that may be present in real-world instances.
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In such cases, unauthenticated and unprivileged attackers can perform the above described actions.
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### User with (only) App Administration Permissions
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A more likely scenario is an administrative user (e.g. a normal developer) having only permissions to manage applications.
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This relatively user could use the described attacks to perform a privilege escalation.
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### Workaround
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It is recommended to upgrade to the patched version of authentik. If not possible, ensure that OAuth2 providers do not use a wildcard (`*` or `.*`) value as allowed redirect URI setting. (This is _not_ exploitable if part of the redirect URI has a wildcard, for example `https://foo-.*\.bar\.com`)
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### For more information
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If you have any questions or comments about this advisory:
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- Email us at [security@goauthentik.io](mailto:security@goauthentik.io)
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@ -407,6 +407,7 @@ const docsSidebar = {
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},
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items: [
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"security/policy",
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"security/CVE-2024-21637",
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"security/CVE-2023-48228",
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"security/GHSA-rjvp-29xq-f62w",
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"security/CVE-2023-39522",
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