#VU97454 Improper verification of cryptographic signature in SAML SSO for Ruby - CVE-2024-45409

Vulnerability identifier: #VU97454

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2024-45409

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
SAML SSO for Ruby
Web applications / Other software

Vendor: SAML-Toolkits

Description

The vulnerability allows a remote attacker to bypass SAML authentication.

The vulnerability exists due to the library does not properly verify the signature of the SAML Response. A remote non-authenticated attacker with access to any signed SAML document (by the IdP) can forge a SAML Response/Assertion with arbitrary contents, bypass authentication process and login under an arbitrary account within the application.

Successful exploitation of the vulnerability may allow an attacker to compromise the affected application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SAML SSO for Ruby: 1.0.0, 1.1.0 - 1.16.0, 1.2.0, 1.3.0 - 1.3.1, 1.4.0 - 1.4.3, 1.5.0, 1.6.0 - 1.6.2, 1.7.0 - 1.7.2, 1.8.0, 1.9.0

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External links
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-jw9c-mfg7-9rx2
https://github.com/SAML-Toolkits/ruby-saml/commit/1ec5392bc506fe43a02dbb66b68741051c5ffeae
https://github.com/SAML-Toolkits/ruby-saml/commit/4865d030cae9705ee5cdb12415c654c634093ae7

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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. However, proof of concept for this vulnerability is available.