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SimpleSAMLphp vulnerable to XXE in parsing SAML messages

High severity GitHub Reviewed Published Dec 2, 2024 in simplesamlphp/simplesamlphp

Package

composer simplesamlphp/simplesamlphp (Composer)

Affected versions

>= 2.3.0, < 2.3.4
>= 2.2.0, < 2.2.4
>= 2.1.0, < 2.1.7
< 2.0.15

Patched versions

2.3.4
2.2.4
2.1.7
2.0.15

Description

Summary

When loading an (untrusted) XML document, for example the SAMLResponse, it's possible to induce an XXE.

Mitigation:

Remove the LIBXML_DTDLOAD | LIBXML_DTDATTR options from $options is in: https://github.com/simplesamlphp/saml2/blob/717c0adc4877ebd58428637e5626345e59fa0109/src/SAML2/DOMDocumentFactory.php#L41

Background / details

To be published on Dec 8th

References

@tvdijen tvdijen published to simplesamlphp/simplesamlphp Dec 2, 2024
Published to the GitHub Advisory Database Dec 2, 2024
Reviewed Dec 2, 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
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-j5g2-q29x-cw3h

Source code

Credits

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