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

High severity GitHub Reviewed Published Mar 24, 2020 in Sustainsys/Saml2 • Updated Feb 1, 2023

Package

nuget Sustainsys.Saml2 (NuGet)

Affected versions

>= 2.0.0, < 2.5.0

Patched versions

2.5.0

Description

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:

References

@AndersAbel AndersAbel published to Sustainsys/Saml2 Mar 24, 2020
Reviewed Mar 25, 2020
Published by the National Vulnerability Database Mar 25, 2020
Published to the GitHub Advisory Database Mar 25, 2020
Last updated Feb 1, 2023

Severity

High
8.2
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Weaknesses

CVE ID

CVE-2020-5261

GHSA ID

GHSA-g6j2-ch25-5mmv

Source code

No known source code
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