CVE-2017-17858 : Security Advisory and Response

Artifex MuPDF version 1.12.0 is susceptible to a heap-based buffer overflow vulnerability that can be exploited by a remote attacker through a specially crafted PDF file.

Understanding CVE-2017-17858

This CVE entry describes a critical vulnerability in Artifex MuPDF version 1.12.0.

What is CVE-2017-17858?

The vulnerability lies in the ensure_solid_xref function in pdf/pdf-xref.c, allowing a remote attacker to potentially execute arbitrary code by leveraging unrestricted xref subsection object numbers.

The Impact of CVE-2017-17858

The vulnerability poses a severe risk as it enables remote attackers to execute arbitrary code through a malicious PDF file.

Technical Details of CVE-2017-17858

Artifex MuPDF version 1.12.0 is affected by a critical heap-based buffer overflow vulnerability.

Vulnerability Description

The vulnerability exists in the ensure_solid_xref function in pdf/pdf-xref.c, allowing remote attackers to execute arbitrary code via a crafted PDF file.

Affected Systems and Versions

Product: Artifex MuPDF
Version: 1.12.0

Exploitation Mechanism

The vulnerability can be exploited by a remote attacker through a specially crafted PDF file, taking advantage of unrestricted xref subsection object numbers.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2017-17858.

Immediate Steps to Take

Update Artifex MuPDF to a patched version that addresses the vulnerability.
Avoid opening PDF files from untrusted or unknown sources.

Long-Term Security Practices

Regularly update software and applications to the latest secure versions.
Implement network security measures to prevent unauthorized access.

Patching and Updates

Apply patches and updates provided by Artifex to fix the vulnerability and enhance system security.