CVE-2021-26119 : Exploit Details and Defense Strategies

Smarty before 3.1.39 allows a Sandbox Escape because $smarty.template_object can be accessed in sandbox mode.

Understanding CVE-2021-26119

This CVE identifies a vulnerability in Smarty that enables a Sandbox Escape due to the ability to access $smarty.template_object in sandbox mode.

What is CVE-2021-26119?

CVE-2021-26119 relates to an issue in Smarty versions before 3.1.39, where an attacker could escape the sandbox and potentially execute malicious code due to improper handling of template objects.

The Impact of CVE-2021-26119

The impact of this vulnerability is significant as it allows threat actors to bypass security restrictions implemented by the sandbox mode, leading to unauthorized access and potential exploitation of the system.

Technical Details of CVE-2021-26119

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability in Smarty before 3.1.39 permits a Sandbox Escape by enabling access to $smarty.template_object within sandbox mode, creating a potential security gap.

Affected Systems and Versions

All versions of Smarty preceding 3.1.39 are affected by this vulnerability, highlighting the importance of immediate action to mitigate risks.

Exploitation Mechanism

By leveraging the ability to access $smarty.template_object in sandbox mode, threat actors can elevate privileges and execute arbitrary code, jeopardizing the integrity of the system.

Mitigation and Prevention

To safeguard systems from CVE-2021-26119, proactive measures need to be taken to address the vulnerability.

Immediate Steps to Take

Immediate actions include updating Smarty to version 3.1.39 or newer, applying patches, and reviewing system logs for any signs of exploitation.

Long-Term Security Practices

Implementing strict input validation, regular security audits, and educating users on safe coding practices can enhance overall system security and resilience.

Patching and Updates

Regularly check for security advisories, subscribe to vendor notifications, and promptly apply patches to eliminate known vulnerabilities and bolster system defenses.