GHSA-9475-xg6m-j7pw

Source

https://github.com/advisories/GHSA-9475-xg6m-j7pw

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/04/GHSA-9475-xg6m-j7pw/GHSA-9475-xg6m-j7pw.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9475-xg6m-j7pw

Aliases

CVE-2020-5268

Published

2020-04-22T20:59:37Z

Modified

2024-02-16T08:20:52.961508Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N CVSS Calculator

Summary

Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET

Details

Impact

Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a tocken to create a log in session.

Patches

Version 1.0.2 and 2.7.0 are patched.

Workarounds

Ensure that any IdentityProvider trusted by the Sustainsys.Saml2 SP only issues bearer tokens if the audience matches the Sustainsys.Saml2 SP.

For more information

If you have any questions or comments about this advisory: * Comment on #103 * Email us at security@sustainsys.com if you think that there are further security issues.

Database specific

{
    "nvd_published_at": null,
    "cwe_ids": [
        "CWE-303"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2020-04-21T18:41:43Z"
}

References

Affected packages

NuGet / Sustainsys.Saml2

Package

Name: Sustainsys.Saml2; View open source insights on deps.dev
Purl: pkg:nuget/Sustainsys.Saml2

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.0.2

Affected versions

0.*

0.23.0

0.24.0

1.*

1.0.0

1.0.1

NuGet / Sustainsys.Saml2

Package

Name: Sustainsys.Saml2; View open source insights on deps.dev
Purl: pkg:nuget/Sustainsys.Saml2

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.0.0

Fixed

2.7.0

Affected versions

2.*

2.0.0

2.1.0

2.2.0

2.3.0

2.4.0

2.5.0

2.6.0