CVE-2020-5268

Description

In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. 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 token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.

Risk Information

Base Score

7.3

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.295

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2020-5268 are fixed in Nuget - Sustainsys.Saml2 1.0.2	Windows
Vulnerabilities CVE-2020-5268 are fixed in Nuget - Sustainsys.Saml2 2.7.0	Windows
Vulnerabilities CVE-2020-5268 are fixed in Nuget - Sustainsys.Saml2 for Linux 1.0.2	Linux
Vulnerabilities CVE-2020-5268 are fixed in Nuget - Sustainsys.Saml2 for Linux 2.7.0	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234