CVE-2020-16303 : Security Advisory and Response

A use-after-free vulnerability in xps_finish_image_path() in devices/vector/gdevxps.c of Artifex Software GhostScript v9.50 allows a remote attacker to escalate privileges via a crafted PDF file. This is fixed in v9.51.

Understanding CVE-2020-16303

This CVE involves a critical vulnerability in GhostScript that could lead to privilege escalation.

What is CVE-2020-16303?

CVE-2020-16303 is a use-after-free vulnerability in GhostScript v9.50 that enables a remote attacker to elevate privileges by exploiting a specially crafted PDF file.

The Impact of CVE-2020-16303

The vulnerability allows attackers to execute arbitrary code, potentially leading to unauthorized access, data theft, and further compromise of the affected system.

Technical Details of CVE-2020-16303

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

Vulnerability Description

The use-after-free flaw in xps_finish_image_path() in GhostScript v9.50 can be exploited by an attacker to gain escalated privileges.

Affected Systems and Versions

Affected Version: GhostScript v9.50
Fixed Version: GhostScript v9.51

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking a user into opening a malicious PDF file, triggering the use-after-free condition and allowing privilege escalation.

Mitigation and Prevention

Protecting systems from CVE-2020-16303 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update GhostScript to version 9.51 to mitigate the vulnerability.
Avoid opening PDF files from untrusted or unknown sources.
Implement strict file validation and sanitization processes.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security training to educate users on identifying and handling suspicious files.
Employ network monitoring and intrusion detection systems to detect and prevent malicious activities.

Patching and Updates

Ensure continuous monitoring for security updates and apply patches as soon as they are released to address known vulnerabilities.