CVE-2020-5261: Authentication Bypass by Capture-replay

March 25, 2020 (updated March 24, 2021)

Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions.

References

github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
github.com/Sustainsys/Saml2/issues/711
github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv
nvd.nist.gov/vuln/detail/CVE-2020-5261

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