Vulnerability CVE-2020-5261
Published: 2020-03-25

Description:
Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 is not affected. It has a correct Token Replay Implementation and is safe to use. Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 have a faulty implementation of Token Replay Detection. Token Replay Detection is an important defense measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 and prior versions are not affected. These versions have a correct Token Replay Implementation and are safe to use.

Type:

CWE-294

 (Authentication Bypass by Capture-replay)

CVSS2 => (AV:N/AC:M/Au:S/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
4.9/10
6.8/10
Exploit range
Attack complexity
Authentication
Remote
Medium
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Simplesamlphp -> Saml2 

 References:
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
https://github.com/Sustainsys/Saml2/issues/711
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv
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