CVE-2023-41890 Sustainsys.Saml2 Insufficient Identity Provider Issuer Validation

2023-09-1914:38:55

CWE-289

CWE-294

GitHub_M

www.cve.org

saml2p

identity provider

validation

asp.net

authenticationproperties

sustainsys.saml2

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

0.001 Low

EPSS

Percentile

22.1%

JSON

Sustainsys.Saml2 library adds SAML2P support to ASP.NET web sites, allowing the web site to act as a SAML2 Service Provider.
Prior to versions 1.0.3 and 2.9.2, when a response is processed, the issuer of the Identity Provider is not sufficiently validated. This could allow a malicious identity provider to craft a Saml2 response that is processed as if issued by another identity provider. It is also possible for a malicious end user to cause stored state intended for one identity provider to be used when processing the response from another provider. An application is impacted if they rely on any of these features in their authentication/authorization logic: the issuer of the generated identity and claims; or items in the stored request state (AuthenticationProperties). This issue is patched in versions 2.9.2 and 1.0.3. The AcsCommandResultCreated notification can be used to add the validation required if an upgrade to patched packages is not possible.

CNA Affected

[
  {
    "vendor": "Sustainsys",
    "product": "Saml2",
    "versions": [
      {
        "version": "< 1.0.3",
        "status": "affected"
      },
      {
        "version": ">= 2.0.0, < 2.9.2",
        "status": "affected"
      }
    ]
  }
]