Headline
CVE-2023-36820: Invalid IdTokenClaimsValidator logic on aud
Micronaut Security is a security solution for applications. Prior to versions 3.1.2, 3.2.4, 3.3.2, 3.4.3, 3.5.3, 3.6.6, 3.7.4, 3.8.4, 3.9.6, 3.10.2, and 3.11.1, IdTokenClaimsValidator skips aud claim validation if token is issued by same identity issuer/provider. Any OIDC setup using Micronaut where multiple OIDC applications exists for the same issuer but token auth are not meant to be shared. This issue has been patched in versions 3.1.2, 3.2.4, 3.3.2, 3.4.3, 3.5.3, 3.6.6, 3.7.4, 3.8.4, 3.9.6, 3.10.2, and 3.11.1.
Package
maven io.micronaut.security:micronaut-security-oauth2 (Maven)
Affected versions
>= 3.11.0, < 3.11.1
>= 3.10.0, < 3.10.2
>= 3.9.0, < 3.9.6
>= 3.8.0, < 3.8.4
>= 3.7.0, < 3.7.4
>= 3.6.0, < 3.6.6
>= 3.5.0, < 3.5.3
>= 3.4.0, < 3.4.3
>= 3.3.0, < 3.3.2
>= 3.2.0, < 3.2.4
>= 3.1.0, < 3.1.2
< 3.1
Patched versions
>= 3.11.1
>= 3.10.2
>= 3.9.6
>= 3.8.4
>= 3.7.4
>= 3.6.6
>= 3.5.3
>= 3.4.3
>= 3.3.2
>= 3.2.4
>= 3.1.2
n/a
Description
Summary
IdTokenClaimsValidator skips aud claim validation if token is issued by same identity issuer/provider.
Details
See https://github.com/micronaut-projects/micronaut-security/blob/master/security-oauth2/src/main/java/io/micronaut/security/oauth2/client/IdTokenClaimsValidator.java#L202
This logic violates point 3 of https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation.
Workaround exists by setting micronaut.security.token.jwt.claims-validators.audience with valid values.
micronaut.security.token.jwt.claims-validators.openid-idtoken can be kept as default on.
PoC
Should probably be:
return issuer.equalsIgnoreCase(iss) &&
audiences.contains(clientId) &&
validateAzp(claims, clientId, audiences);
Impact
Any OIDC setup using Micronaut where multiple OIDC applications exists for the same issuer but token auth are not meant to be shared.
Related news
### Summary IdTokenClaimsValidator skips `aud` claim validation if token is issued by same identity issuer/provider. ### Details See https://github.com/micronaut-projects/micronaut-security/blob/master/security-oauth2/src/main/java/io/micronaut/security/oauth2/client/IdTokenClaimsValidator.java#L202 This logic violates point 3 of https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation. Workaround exists by setting `micronaut.security.token.jwt.claims-validators.audience` with valid values. `micronaut.security.token.jwt.claims-validators.openid-idtoken` can be kept as default on. ### PoC Should probably be: ```java return issuer.equalsIgnoreCase(iss) && audiences.contains(clientId) && validateAzp(claims, clientId, audiences); ``` ### Impact Any OIDC setup using Micronaut where multiple OIDC applications exists for the same issuer but token auth are not meant to be shared.