CVE-2017-18122

Name: CVE-2017-18122
Creator: NVD / NIST
Published: 2018-02-02T15:29:00.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.12%

Last modified Jun 17, 2026

CVE-2017-18122 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.12%

62.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Simplesamlphp	Simplesamlphp	<= 1.14.16
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

https://lists.debian.org/debian-lts-announce/2018/02/msg00008.htmlMailing List, Third Party Advisory
https://simplesamlphp.org/security/201710-01Patch, Vendor Advisory
https://www.debian.org/security/2018/dsa-4127Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00008.htmlMailing List, Third Party Advisory
https://simplesamlphp.org/security/201710-01Patch, Vendor Advisory
https://www.debian.org/security/2018/dsa-4127Third Party Advisory

Timeline

Published: Feb 2, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-18122?

How severe is CVE-2017-18122?

Severity scoring for CVE-2017-18122 is pending analysis. The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2017-18122?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-18122?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST