Vulnerability identifier: #VU26503

Vulnerability risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5261

CWE-ID: CWE-294

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 on the target system.

The vulnerability exists due to improper implementation of Token Replay Detection. A remote authenticated attacker can bypass authentication process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Sustainsys.Saml2: 2.0.0 - 2.4.0

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External links
http://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
http://github.com/Sustainsys/Saml2/issues/711
http://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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