Duende Blog

Duende.AccessTokenManagement 3.0 is out now! Highlights of this release include:

• Improved support for Blazor Server
• Updates to dependencies
• Bug fixes and improvements

See the release notes for the full details, or read on for a quick summary.

Today we are publishing a hotfix for all supported versions of Duende.IdentityServer that addresses CVE-2024-39694, a moderate severity open redirect security vulnerability. We encourage everyone to update to the latest patch version. Note that by itself, this vulnerability does not allow an attacker to steal tokens or user credentials. An attacker would most likely exploit this vulnerability to make phishing attacks more likely to succeed.

We have also published a security advisory with technical details about the severity, affected versions, specific APIs involved, and work-arounds for those who can't upgrade to a patched version.

In this blog post we'll discuss open redirect vulnerabilities more generally, the process we followed to manage disclosure of the issue and patch, and lessons learned from that process.

Historically, IdentityServer could either issue reusable refresh tokens or enforce refresh token rotation. The default value was "rotate" which can often lead to problems. In IdentityServer 7.0, we made the decision to change the default behavior of refresh tokens so that they would be reusable by default. In this blog post, we'll describe refresh tokens and their security in detail and explain why we made this choice.

Pretty much exactly one year after the release of IdentityServer v6, we are happy to announce our next major version: IdentityServer v7.

OpenTelemetry is a collection of tools, APIs, and SDKs for generating and collecting telemetry data (metrics, logs, and traces). This is very useful for analyzing software performance and behavior, especially in highly distributed systems.

We started our journey with Traces in Duende IdentityServer v6.1. .NET 8 has full support for Open Telemetry and so does Duende IdentityServer v7. IdentityServer emits traces, metrics and logs.

Implementing Proof of Possession tokens in native mobile applications with IdentityModel.OidcClient