CVE-2021-28545 : What You Need to Know

Adobe Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier are vulnerable due to missing integrity check support. An attacker could manipulate data in a certified PDF file without invalidating the original certification, with user interaction required for exploitation.

Understanding CVE-2021-28545

This CVE relates to a critical vulnerability in Adobe Acrobat Reader affecting certain versions released prior to specific updates.

What is CVE-2021-28545?

CVE-2021-28545 highlights the absence of integrity check support in older versions of Adobe Acrobat Reader DC, which allows unauthenticated attackers to modify data within certified PDF files without disrupting the original certification. Successful exploitation demands victim interaction in opening a tampered PDF file.

The Impact of CVE-2021-28545

This vulnerability poses a high severity risk, with a CVSS base score of 8.1. It carries a high impact on confidentiality and integrity, although it does not affect availability. The attack complexity is rated as low, with no privileges required and user interaction being necessary.

Technical Details of CVE-2021-28545

The vulnerability in Adobe Acrobat Reader DC lies in the absence of integrity check support, making it susceptible to unauthorized data manipulation.

Vulnerability Description

The flaw allows attackers to tamper with data in certified PDFs without voiding the certification, enabling malicious modifications through user interaction.

Affected Systems and Versions

Adobe Acrobat Reader DC versions including 2020.013.20074, 2020.001.30018, and 2017.011.30188 are impacted by the integrity check support deficiency.

Exploitation Mechanism

Exploitation of this vulnerability requires a victim to open a manipulated PDF file, granting the attacker the opportunity to alter the file's contents.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-28545, it is crucial to take immediate action and implement long-term security measures.

Immediate Steps to Take

Users should update Adobe Acrobat Reader to the latest version to patch the vulnerability and prevent potential exploitation. Caution must be exercised when interacting with PDF files from untrusted sources.

Long-Term Security Practices

Developing a robust security posture that includes regular software updates, user awareness training, and secure PDF handling protocols can enhance overall defense against such vulnerabilities.

Patching and Updates

Regularly monitor Adobe's security advisories and apply patches promptly to address known vulnerabilities and protect systems from potential threats.