CVE-2017-18122
High
Description
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Simplesamlphp
PublishedFeb 2, 2018
First seenFeb 2, 2018
How to fix
Update
- simplesamlphp/simplesamlphp1.14.17 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| simplesamlphp simplesamlphp | v ≤ 1.14.16 | — |
| debian debian_linux | 7.0, 8.0, 9.0 | — |
| simplesamlphp/simplesamlphpPackagist | v < 1.14.17 | 1.14.17 |
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