Improper Verification of Cryptographic Signature in SimpleSAMLphp - CVE-2018-7644
Published: March 5, 2018 / Updated: July 17, 2020
Vulnerability identifier: #VU31347
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2018-7644
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SimpleSAMLphp
Affected software:
SimpleSAMLphp
SimpleSAMLphp
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
How to mitigate CVE-2018-7644
Install update from vendor's website.