Vulnerability · Published Oct 2, 2020 · Assigned by mitre
CVE-2020-12676
Critical 9.1
In plain English
A critical-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.9% (higher than 87% of all known vulnerabilities).
Severity (CVSS NVD)9.1Critical
Exploit odds (30 days)2.9%top 12.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a "Signature exclusion attack".
Affected products (as reported)
References
- https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdf x_refsource_MISC
- https://github.com/SAMLRaider/SAMLRaider x_refsource_MISC
- 20201002 CVE-2020-12676 - FusionAuth SAML v2.0 bindings in Java using JAXB - Signature Exclusion Attack mailing-list, x_refsource_FULLDISC
- https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txt x_refsource_MISC
- http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.html x_refsource_MISC