CVE-2017-18122

A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.

Score

CVSS 3.0 8.1 High

Status

Modified - cve@mitre.org

Published

2018-02-02

Last modified

2024-08-05

Weaknesses

CWE-347

Affected products

• Debian Linux (Debian)
• Simplesamlphp (Simplesamlphp)

References

• https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
• https://simplesamlphp.org/security/201710-01
• https://www.debian.org/security/2018/dsa-4127