CVE-2017-18122 : Vulnerability Insights and Analysis

SimpleSAMLphp version 1.14.16 is affected by a signature-validation bypass vulnerability, allowing attackers to impersonate users from any Identity Provider. This CVE was published on February 2, 2018, by MITRE.

Understanding CVE-2017-18122

What is CVE-2017-18122?

A flaw in SimpleSAMLphp allows unsigned SAML responses with multiple signed assertions to be considered valid, enabling impersonation attacks.

The Impact of CVE-2017-18122

This vulnerability permits attackers to impersonate any user from any Identity Provider by providing a signed assertion from the targeted IdP.

Technical Details of CVE-2017-18122

Vulnerability Description

The issue in SimpleSAMLphp through version 1.14.16 allows unsigned SAML responses with multiple signed assertions to be accepted, leading to impersonation.

Affected Systems and Versions

Product: SimpleSAMLphp
Vendor: N/A
Versions: 1.14.16

Exploitation Mechanism

A SimpleSAMLphp Service Provider using SAML 1.1 considers any unsigned SAML response with multiple signed assertions as valid if at least one assertion has a valid signature.

Mitigation and Prevention

Immediate Steps to Take

Update SimpleSAMLphp to a patched version.
Monitor for any unauthorized access or unusual activities.

Long-Term Security Practices

Implement strict signature validation checks for SAML responses.
Conduct regular security assessments and audits.

Patching and Updates

Apply security patches promptly to mitigate the vulnerability.