CVE-2019-12493 : Security Advisory and Response

Xpdf version 4.01.01 is vulnerable to a stack-based buffer over-read in the PostScriptFunction::transform function, potentially leading to Denial of Service or memory data exposure when processing specially crafted PDF documents.

Understanding CVE-2019-12493

This CVE identifies a vulnerability in Xpdf version 4.01.01 that can be exploited through a specific PDF document to trigger a stack-based buffer over-read.

What is CVE-2019-12493?

The vulnerability arises from the mishandling of tint transform functions by GfxSeparationColorSpace and GfxDeviceNColorSpace components in Function.cc.
Attackers can exploit this flaw by sending a maliciously crafted PDF document to the pdftops tool.

The Impact of CVE-2019-12493

Successful exploitation could result in a Denial of Service condition or the potential exposure of sensitive memory data.

Technical Details of CVE-2019-12493

Xpdf version 4.01.01 is susceptible to a stack-based buffer over-read due to mishandling of tint transform functions.

Vulnerability Description

The vulnerability exists in the PostScriptFunction::transform function in Function.cc.

Affected Systems and Versions

Xpdf version 4.01.01 is affected.

Exploitation Mechanism

Exploitation involves sending a specially crafted PDF document to the pdftops tool.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-12493.

Immediate Steps to Take

Update Xpdf to a non-vulnerable version.
Avoid opening PDF files from untrusted sources.
Monitor vendor security advisories for patches.

Long-Term Security Practices

Regularly update software to the latest versions.
Implement network and system security best practices.

Patching and Updates

Apply patches provided by Xpdf promptly to mitigate the vulnerability.