CVE-2021-46433 : Security Advisory and Response

In fenom 2.12.1 and before, a vulnerability exists that allows for the execution of arbitrary PHP code when certain conditions are met.

Understanding CVE-2021-46433

This CVE concerns a security issue in the Fenom templating engine that could lead to the execution of unauthorized PHP code.

What is CVE-2021-46433?

The vulnerability in Fenom 2.12.1 and earlier versions allows an attacker to bypass sandbox restrictions and run arbitrary PHP code if

disable_native_funcs

is set to true.

The Impact of CVE-2021-46433

This vulnerability could be exploited by malicious actors to execute unauthorized PHP code on the affected system, potentially leading to further security breaches.

Technical Details of CVE-2021-46433

This section provides more insight into the technical aspects of the CVE.

Vulnerability Description

The flaw exists in the

getTemplateCode()

function within

fenom/src/Fenom/Template.php

, enabling the bypass of sandbox restrictions to execute arbitrary PHP code.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to and including 2.12.1

Exploitation Mechanism

The vulnerability arises when the

disable_native_funcs

configuration is set to true, allowing an attacker to circumvent sandbox controls and execute unauthorized PHP code.

Mitigation and Prevention

It is crucial to take immediate action to mitigate the risks associated with CVE-2021-46433.

Immediate Steps to Take

Update Fenom to a patched version that addresses the security vulnerability.
Review and adjust the

disable_native_funcs

setting to prevent unauthorized code execution.

Long-Term Security Practices

Regularly monitor for security updates and patches released by the Fenom team.
Implement secure coding practices to minimize the risk of code injection vulnerabilities.

Patching and Updates

Apply patches provided by Fenom promptly to address the vulnerability and enhance system security.