CVE-2023-28081 Explained : Impact and Mitigation

This CVE record was published by Facebook on May 18, 2023, after being reserved on March 10, 2023. The vulnerability affects the "Hermes" product by Facebook, specifically versions prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81. It is related to a bytecode optimization bug that could lead to an use-after-free scenario, enabling attackers to execute arbitrary code through a specially crafted payload. Notably, this vulnerability is exploitable in cases where Hermes is utilized to run untrusted JavaScript, hence potentially impacting certain React Native applications.

Understanding CVE-2023-28081

This section delves into the details of the CVE-2023-28081 vulnerability.

What is CVE-2023-28081?

The CVE-2023-28081 vulnerability is rooted in a bytecode optimization flaw within the Hermes product, allowing threat actors to trigger an use-after-free situation and achieve unauthorized code execution by leveraging a meticulously crafted payload. It primarily impacts instances where untrusted JavaScript is executed using Hermes, with most React Native applications remaining unaffected by this exploit.

The Impact of CVE-2023-28081

The impact of CVE-2023-28081 can be severe, as it opens up the possibility of attackers executing arbitrary code on affected systems. With the potential for use-after-free scenarios, sensitive information could be compromised, and malicious activities could be carried out, emphasizing the critical nature of addressing this vulnerability promptly.

Technical Details of CVE-2023-28081

This section delves into the technical aspects of CVE-2023-28081.

Vulnerability Description

The vulnerability in question arises from a bytecode optimization bug present in Hermes versions preceding commit e6ed9c1a4b02dc219de1648f44cd808a56171b81. This flaw enables threat actors to orchestrate an use-after-free scenario and execute arbitrary code, posing significant security risks to impacted systems.

Affected Systems and Versions

The Hermes product by Facebook, specifically versions prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81, are susceptible to CVE-2023-28081. Organizations utilizing Hermes for executing untrusted JavaScript should take immediate action to mitigate this vulnerability.

Exploitation Mechanism

To exploit CVE-2023-28081, attackers can leverage a carefully crafted payload to trigger the use-after-free scenario within Hermes, subsequently gaining the ability to execute malicious code on the targeted system. This highlights the importance of applying relevant security measures to prevent unauthorized exploitation.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent the impact of CVE-2023-28081.

Immediate Steps to Take

Organizations and individuals using the affected versions of Hermes should update to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 or later to eliminate the bytecode optimization bug and thwart potential exploitation attempts. Additionally, limiting the execution of untrusted JavaScript using Hermes can reduce the attack surface.

Long-Term Security Practices

In the long term, practicing secure coding principles, conducting regular security audits, and staying informed about software vulnerabilities can enhance overall security posture and help prevent similar exploits in the future.

Patching and Updates

Regularly updating software components, including Hermes, to the latest secure versions is crucial in addressing known vulnerabilities and ensuring a robust defense against emerging threats. Being proactive in applying patches and fixes can significantly reduce the risk of exploitation.