Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-32701

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
22/06/2021
Last modified:
30/06/2021

Description

ORY Oathkeeper is an Identity & Access Proxy (IAP) and Access Control Decision API that authorizes HTTP requests based on sets of Access Rules. When you make a request to an endpoint that requires the scope `foo` using an access token granted with that `foo` scope, introspection will be valid and that token will be cached. The problem comes when a second requests to an endpoint that requires the scope `bar` is made before the cache has expired. Whether the token is granted or not to the `bar` scope, introspection will be valid. A patch will be released with `v0.38.12-beta.1`. Per default, caching is disabled for the `oauth2_introspection` authenticator. When caching is disabled, this vulnerability does not exist. The cache is checked in [`func (a *AuthenticatorOAuth2Introspection) Authenticate(...)`](https://github.com/ory/oathkeeper/blob/6a31df1c3779425e05db1c2a381166b087cb29a4/pipeline/authn/authenticator_oauth2_introspection.go#L152). From [`tokenFromCache()`](https://github.com/ory/oathkeeper/blob/6a31df1c3779425e05db1c2a381166b087cb29a4/pipeline/authn/authenticator_oauth2_introspection.go#L97) it seems that it only validates the token expiration date, but ignores whether the token has or not the proper scopes. The vulnerability was introduced in PR #424. During review, we failed to require appropriate test coverage by the submitter which is the primary reason that the vulnerability passed the review process.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:M/Au:N/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): None
Availability (A): None

Base Score 2.0
4.30
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:ory:oathkeeper:0.38.0:beta2:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.1:beta2:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.2:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.3:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.4:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.5:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.6:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.7:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.8:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.9:beta1:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.10:beta2:*:*:*:*:*:*
cpe:2.3:a:ory:oathkeeper:0.38.11:beta1:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools