CVE-2020-27860 : What You Need to Know

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 10.0.1.35811. 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 XFA templates. 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 data structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-11727.

Understanding CVE-2020-27860

This CVE identifies a critical vulnerability in Foxit Reader that could allow remote attackers to execute arbitrary code.

What is CVE-2020-27860?

Vulnerability Type: Out-of-bounds Write (CWE-787)
CVSS Base Score: 7.8 (High Severity)
Attack Vector: Local
User Interaction: Required
Impact: High confidentiality, integrity, and availability

The Impact of CVE-2020-27860

This vulnerability can have severe consequences:

Remote attackers can execute arbitrary code on affected systems
User interaction is necessary, typically through visiting a malicious page or opening a malicious file
Exploitation occurs due to improper validation of user-supplied data

Technical Details of CVE-2020-27860

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The flaw allows attackers to execute code within the current process by exploiting XFA template processing.

Affected Systems and Versions

Product: Foxit Reader
Version: 10.0.1.35811

Exploitation Mechanism

Attack Complexity: Low
Privileges Required: None
Scope: Unchanged
Exploitation requires user interaction, such as visiting a malicious page or opening a malicious file

Mitigation and Prevention

Protecting systems from this vulnerability is crucial for maintaining security.

Immediate Steps to Take

Update Foxit Reader to the latest version
Be cautious when visiting unknown websites or opening files from untrusted sources

Long-Term Security Practices

Regularly update software and security patches
Implement security measures to prevent unauthorized code execution

Patching and Updates

Foxit Software may release patches to address this vulnerability