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SimpleSAMLphp Session fixation issue and authentication bypass in the authcrypt module

Critical severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated May 5, 2024

Package

composer simplesamlphp/simplesamlphp (Composer)

Affected versions

>= 1.14.12, < 1.14.14

Patched versions

1.14.14

Description

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and earlier, when used with PHP before 5.6, allows attackers to conduct session fixation attacks or possibly bypass authentication by leveraging missing character conversions before an XOR operation.

References

Published by the National Vulnerability Database Sep 1, 2017
Published to the GitHub Advisory Database May 14, 2022
Reviewed Apr 25, 2024
Last updated May 5, 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
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.363%
(73rd percentile)

Weaknesses

CVE ID

CVE-2017-12868

GHSA ID

GHSA-j96g-47x2-46hv

Source code

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