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Access to restricted PHP code by dynamic static class access in smarty

High severity GitHub Reviewed Published Jan 10, 2022 in smarty-php/smarty • Updated Feb 7, 2024

Package

composer smarty/smarty (Composer)

Affected versions

< 3.1.43
>= 4.0.0, < 4.0.3

Patched versions

3.1.43
4.0.3

Description

Impact

Template authors could run restricted static php methods.

Patches

Please upgrade to 3.1.40 or higher.

References

See the documentation on Smarty security features on the static_classes access filter.

For more information

If you have any questions or comments about this advisory please open an issue in the Smarty repo

References

@wisskid wisskid published to smarty-php/smarty Jan 10, 2022
Published by the National Vulnerability Database Jan 10, 2022
Reviewed Jan 10, 2022
Published to the GitHub Advisory Database Jan 12, 2022
Last updated Feb 7, 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
Low
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.203%
(59th percentile)

Weaknesses

CVE ID

CVE-2021-21408

GHSA ID

GHSA-4h9c-v5vg-5m6m

Source code

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