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Unguarded calls to __isset() and to array-accesses in a sandbox

Low
fabpot published GHSA-jjxq-ff2g-95vh Nov 6, 2024

Package

composer twig/twig (Composer)

Affected versions

<3.11.2
>=3.12,<3.14.1

Patched versions

3.11.2
3.14.1

Description

Description

In a sandbox, and attacker can access attributes of Array-like objects as they were not checked by the security policy.
They are now checked via the property policy and the __isset() method is now called after the security check.
This is a BC break.

Resolution

The sandbox mode now ensures access to array-like's properties is allowed.

The patch for this issue is available here for the 3.11.x branch, and here for the 3.x branch.

Credits

We would like to thank Jamie Schouten for reporting the issue and Nicolas Grekas for providing the fix.

Severity

Low

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
High
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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:H/PR:H/UI:N/S:U/C:L/I:N/A:N

CVE ID

CVE-2024-51755

Weaknesses

No CWEs

Credits