CVE-2021-30354 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2021-30354, a vulnerability found in the Amazon Kindle e-reader prior to and including version 5.13.4 that can lead to code execution via a crafted PDF book.

Understanding CVE-2021-30354

This section explores the impact, technical details, and mitigation strategies for CVE-2021-30354.

What is CVE-2021-30354?

CVE-2021-30354 is an Integer Overflow vulnerability in the Amazon Kindle e-reader that triggers a Heap-Based Buffer Overflow, allowing an attacker to execute malicious code by exploiting the CJBig2Image::expand() function when processing a specially crafted PDF ebook.

The Impact of CVE-2021-30354

The vulnerability poses a severe security risk as it can result in memory corruption, leading to arbitrary code execution on vulnerable devices. Attackers can exploit this flaw to take control of the affected Kindle e-reader.

Technical Details of CVE-2021-30354

Let's delve into the specifics of the vulnerability.

Vulnerability Description

An Integer Overflow in the CJBig2Image::expand() function of Amazon Kindle e-reader versions prior to 5.13.4 triggers a Heap-Based Buffer Overflow, enabling attackers to corrupt memory and execute arbitrary code through a malicious PDF file.

Affected Systems and Versions

The vulnerability affects all versions of the Amazon Kindle e-reader up to and including 5.13.4, putting these devices at risk of exploitation.

Exploitation Mechanism

By leveraging the Integer Overflow to Buffer Overflow weakness, threat actors can craft PDF books that, when parsed by the Kindle e-reader, trigger the memory corruption, ultimately leading to unauthorized code execution.

Mitigation and Prevention

Learn how to protect your devices from CVE-2021-30354.

Immediate Steps to Take

Users should immediately update their Amazon Kindle e-reader to version 5.13.5 or higher to mitigate the vulnerability. Additionally, exercise caution when opening PDF files from untrusted sources.

Long-Term Security Practices

Implementing robust security measures, such as regularly updating software and practicing safe browsing habits, can help prevent future vulnerabilities and protect devices from exploitation.

Patching and Updates

Stay informed about security patches released by Amazon for the Kindle e-reader and apply them promptly to ensure that your device is protected against known vulnerabilities.