Kentor.AuthServices 0.21.2 has just been released to NuGet. It is a security release fixing three issues.
- XML External Entity Injection (affecting .NET 4.5 only)
- Malicious IdP can cause write to arbitrary file
- Flawed ReturnUrl validation leads to Open Redirect
The first two issues were reported by John Heasman, Morgan Roman and Joshua Estalilla from DocuSign. While I have dreaded the day when I would get a security issue I am extremely happy with the professionalism of the disclosure. I got the report privately, including detailed descriptions, reproduction steps and solid recommendations on how to fix it. I am very grateful you took the time to review AuthServices and find the issues and for the detailed reports.
More details on the vulernabilities will be published later.