SimpleSAMLphp Improper Verification of Cryptographic Signature
Date: 2022-05
Affected: composer/simplesamlphp/saml2, composer/simplesamlphp/saml2, composer/simplesamlphp/saml2
Attack vector: deepfake
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2018-7644
CWE: CWE-347
CVSS: 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.


Mitigations:

Architectural layers (MAESTRO):