CVE-2021-28634 : Exploit Details and Defense Strategies

Adobe Acrobat Reader versions 2021.005.20054, 2020.004.30005, and 2017.011.30197 are vulnerable to an OS Command Injection flaw, allowing attackers to execute arbitrary code on the user's system.

Understanding CVE-2021-28634

This CVE relates to an OS Command Injection vulnerability affecting Adobe Acrobat Reader.

What is CVE-2021-28634?

The vulnerability in Acrobat Reader allows authenticated attackers to run arbitrary code on the victim's machine by exploiting a special element neutralization issue in an OS command.

The Impact of CVE-2021-28634

With a CVSS base score of 8.2, this High severity vulnerability can lead to unauthorized arbitrary code execution when a user opens a malicious file.

Technical Details of CVE-2021-28634

This section provides more detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability involves improper neutralization of special elements in OS commands, also known as 'OS Command Injection' (CWE-78).

Affected Systems and Versions

Adobe Acrobat Reader versions 2021.005.20054, 2020.004.30005, and 2017.011.30197 are impacted by this vulnerability.

Exploitation Mechanism

An authenticated attacker can exploit this issue locally, requiring user interaction to open a malicious file for code execution.

Mitigation and Prevention

Protecting systems against CVE-2021-28634 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Users should update Adobe Acrobat Reader to the latest patched version and avoid opening files from untrusted sources.

Long-Term Security Practices

Implementing secure coding practices, maintaining software hygiene, and raising user awareness on safe file handling can mitigate similar vulnerabilities.

Patching and Updates

Regularly check for security updates from Adobe and apply them promptly to ensure protection against known vulnerabilities.