Vulnerability identifier: #VU80923

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-41890

CWE-ID: CWE-289

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Sustainsys.Saml2
Universal components / Libraries / Libraries used by multiple products

Vendor: Sustainsys

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to insufficient identity provider issuer validation. A remote attacker can craft a Saml2 response that is processed as if issued by another identity provider or cause stored state intended for one identity provider to be used when processing the response from another provider.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Sustainsys.Saml2: 1.0.0 - 2.9.1

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External links
http://github.com/Sustainsys/Saml2/security/advisories/GHSA-fv2h-753j-9g39
http://github.com/Sustainsys/Saml2/issues/712
http://github.com/Sustainsys/Saml2/issues/713

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.