#oauth

A parsing vulnerability for the MessageSet type in the ProtocolBuffers versions prior to and including 3.16.1, 3.17.3, 3.18.2, 3.19.4, 3.20.1 and 3.21.5 for protobuf-cpp, and versions prior to and including 3.16.1, 3.17.3, 3.18.2, 3.19.4, 3.20.1 and 4.21.5 for protobuf-python can lead to out of memory failures. A specially crafted message with multiple key-value per elements creates parsing issues, and can lead to a Denial of Service against services receiving unsanitized input. We recommend upgrading to versions 3.18.3, 3.19.5, 3.20.2, 3.21.6 for protobuf-cpp and 3.18.3, 3.19.5, 3.20.2, 4.21.6 for protobuf-python. Versions for 3.16 and 3.17 are no longer updated.

### Impact This issue allows a client of the API to retrieve more information than the client’s OAuth scope permits when making “search-type” requests. This issue would not allow a client to retrieve information about individuals other than those the client was already authorized to access. ### Patches We recommend that users of fhir-works-on-aws-authz-smart 3.1.1 or 3.1.2 upgrade to version 3.1.3 or higher immediately. Versions 3.1.0 and below are unaffected. ### Workarounds There is no workaround for this issue. Please upgrade fhir-works-on-aws-authz-smart to version 3.1.3 or higher. ### References https://github.com/awslabs/fhir-works-on-aws-deployment https://github.com/awslabs/fhir-works-on-aws-authz-smart ### For more information If you have any questions or comments about this advisory: Email us at [[email protected]](mailto:[email protected])

### Impact - Attacker providing malicious redirect uri can cause DoS to oauthlib's web application. - Attacker can also leverage usage of `uri_validate` functions depending where it is used. _What kind of vulnerability is it? Who is impacted?_ Oauthlib applications using OAuth2.0 provider support or use directly `uri_validate` function. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Issue fixed in 3.2.1 release. ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ The `redirect_uri` can be verified in web toolkit (i.e `bottle-oauthlib`, `django-oauth-toolkit`, ...) before oauthlib is called. A sample check if `:` is present to reject the request can prevent the DoS, assuming no port or IPv6 is fundamentally required. ### References Attack Vector: - Attacker providing malicious redirect uri: https://github.com/oauthlib/oauthlib/blob/d4bafd9f1d0eba3766e933b1ac598cbbf37b8914/oauthlib/oauth2/rfc6749/gran...

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OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. In OAuthLib versions 3.1.1 until 3.2.1, an attacker providing malicious redirect uri can cause denial of service. An attacker can also leverage usage of `uri_validate` functions depending where it is used. OAuthLib applications using OAuth2.0 provider support or use directly `uri_validate` are affected by this issue. Version 3.2.1 contains a patch. There are no known workarounds.

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