CVE-2020-8849 : Exploit Details and Defense Strategies

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 9.7.0.29455. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of JPEG2000 files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-9413.

Understanding CVE-2020-8849

This CVE identifies a critical vulnerability in Foxit Reader version 9.7.0.29455.

What is CVE-2020-8849?

CVE-2020-8849 is a security vulnerability that allows remote attackers to execute arbitrary code on systems running Foxit Reader 9.7.0.29455. The flaw is triggered by processing JPEG2000 files without proper validation, enabling attackers to manipulate data and execute malicious code.

The Impact of CVE-2020-8849

The impact of this vulnerability is severe:

Attack Complexity: Low
Attack Vector: Local
Availability Impact: High
Confidentiality Impact: High
Integrity Impact: High
Privileges Required: None
User Interaction: Required

Technical Details of CVE-2020-8849

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability is categorized as CWE-787: Out-of-bounds Write. It stems from inadequate validation of user-supplied data, leading to code execution in the context of the current process.

Affected Systems and Versions

Product: Foxit Reader
Vendor: Foxit
Version: 9.7.0.29455

Exploitation Mechanism

The vulnerability can be exploited when a user interacts with a malicious page or opens a corrupted file, allowing attackers to execute arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2020-8849 requires immediate action and long-term security measures.

Immediate Steps to Take

Update Foxit Reader to the latest version.
Avoid opening files from untrusted or unknown sources.
Exercise caution when visiting unfamiliar websites.

Long-Term Security Practices

Implement regular security updates and patches for all software.
Educate users on safe browsing habits and the risks of opening unknown files.

Patching and Updates

Ensure that all security patches and updates provided by Foxit are promptly applied to mitigate the vulnerability.