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SimpleSAMLphp SAML2 spoof SAML responses

Critical severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Apr 25, 2024

Package

composer simplesamlphp/saml2 (Composer)

Affected versions

>= 1.10, < 1.10.3
< 1.8.1
>= 1.9.0, < 1.9.1
>= 2.0, < 2.3.3

Patched versions

1.10.3
1.8.1
1.9.1
2.3.3

Description

The validateSignature method in the SAML2\Utils class in SimpleSAMLphp before 1.14.10 and simplesamlphp/saml2 library before 1.9.1, 1.10.x before 1.10.3, and 2.x before 2.3.3 allows remote attackers to spoof SAML responses or possibly cause a denial of service (memory consumption) by leveraging improper conversion of return values to boolean.

References

Published by the National Vulnerability Database Feb 17, 2017
Published to the GitHub Advisory Database May 14, 2022
Reviewed Apr 25, 2024
Last updated Apr 25, 2024

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(78th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2016-9814

GHSA ID

GHSA-r8v4-7vwj-983x

Source code

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