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SimpleSAMLphp saml2 incorrect signature validation

High severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Feb 6, 2024

Package

composer simplesamlphp/saml2 (Composer)

Affected versions

< 1.10.6
>= 2.0, < 2.3.8
>= 3.0, < 3.1.4

Patched versions

1.10.6
2.3.8
3.1.4

Description

HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.

References

Published by the National Vulnerability Database Mar 5, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Jul 25, 2023
Last updated Feb 6, 2024

Severity

High

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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
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:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.284%
(69th percentile)

Weaknesses

CVE ID

CVE-2018-7711

GHSA ID

GHSA-g888-g2pp-82hf

Source code

No known source code
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