PT-2020-13197 · Fusionauth · Fusionauth

Published 2020-10-02 · Updated 2021-04-30 · CVE-2020-12676

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions FusionAuth fusionauth-samlv2 version 0.2.3

Description The issue allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, also known as a "Signature exclusion attack".

Recommendations For FusionAuth fusionauth-samlv2 version 0.2.3, consider implementing signature validation for SAML assertions to prevent signature exclusion attacks. As a temporary workaround, restrict access to sensitive resources that rely on SAML authentication until a patch is available.

Exploit

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2020-12676

Affected Products

Fusionauth

References · 9

• 🔥 https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txt · Exploit
• 🔥 http://seclists.org/fulldisclosure/2020/Oct/1 · Exploit
• 🔥 http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.html · Exploit
• 🔥 https://nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdf · Exploit
• https://osv.dev/vulnerability/CVE-2020-12676 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-12676 · Security Note
• https://github.com/SAMLRaider/SAMLRaider · Note
• https://t.me/cybersecuritytechnologies/1853 · Telegram Post
• https://t.me/defcon_news/58474 · Telegram Post