Missing Token Replay Detection in Saml2 Authentication services for ASP.NET

Impact

Token Replay Detection is an important defence in depth measure for Single Sign On solutions. In all previous 2.X versions, the Token Replay Detection is not properly implemented.

Note that version 1.0.1 is not affected. It has a correct Token Replay Implementation and is safe to use.

Patches

The 2.5.0 version is patched.

Workarounds

There are no workarounds with existing versions. Fixing the issue requires code updates.

References

https://en.wikipedia.org/wiki/Replay_attack

For more information

If you have any questions or comments about this advisory:

• Comment on #711.
• Email us at security@sustainsys.com if you think that there are further security issues.