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GHSA-284c-x8m7-9w5h
No affected components available
Summary
A vulnerability has been found in Dapr that causes a leak of the application token of the invoker app to the invoked app when using Dapr as a gRPC proxy for remote service invocation. This issue arises because Dapr sends the app token of the invoker app instead of the app token of the invoked app.
Users who leverage Dapr for gRPC proxy service invocation and are using the app API token feature are encouraged to upgrade Dapr to version 1.13.3.
Impact
This vulnerability impacts Dapr users who use Dapr as a gRPC proxy for remote service invocation as well as the Dapr App API token functionality. An attacker could exploit this vulnerability to gain access to the app token of the invoker app, potentially compromising security and authentication mechanisms.
Patches
The issue has been fixed in Dapr version 1.13.3.
Details
Dapr uses two types of tokens for authentication:
APP_API_TOKEN: Used by Dapr to authenticate to the app.DAPR_API_TOKEN: Used by the app to authenticate to Dapr.
Dapr uses the dapr-api-token metadata in gRPC calls (or header, for HTTP calls) for authentication.
- In communication from dapr to the app, the
dapr-api-tokenmetadata field will carry theAPP_API_TOKEN. - In communication from the app to daprd, the
dapr-api-tokenmetadata field will carry theDAPR_API_TOKEN.
Before version 1.13.0, the APP_API_TOKEN was not being sent to the invoked app for authentication, as reported in this issue. Instead, Dapr was incorrectly using the same DAPR_API_TOKEN that the invoker app had passed to Dapr. This was addressed in PR #7404, but the fix only worked for self-invocation scenarios.
When Dapr needed to communicate with another instance, it would mistakenly include the APP_API_TOKEN of the invoker app in the request. This behavior is incorrect, app tokens should never be included in requests between Dapr sidecars. This vulnerability allows the receiving app to see the app token of the invoker app, leading to potential misuse and security breaches.
The vulnerability is addressed by ensuring that Dapr uses the correct app token (of the invoked app) during gRPC proxy service invocation.
References
- https://docs.dapr.io/operations/security/app-api-token/
- https://github.com/dapr/dapr/issues/7344
- https://github.com/dapr/dapr/pull/7404
Credits
Thanks to Benjamin Delay for reporting this issue.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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