An issue was discovered in DP3T-Backend-SDK before 1.1.1 for Decentralised Privacy-Preserving Proximity Tracing (DP3T). When it is configured to check JWT before uploading/publishing keys, it is possible to skip the signature check by providing a JWT token with alg=none.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15957
Reference (s):
- https://github.com/DP-3T/dp3t-sdk-backend/compare/v1.0.4 v1.1.0
- https://github.com/DP-3T/dp3t-sdk-backend/security/advisories/GHSA-5m5q-3qw2-3xf3
- https://github.com/dp-3T/dp3t-sdk-backend