CVE-2020-25725 : What You Need to Know

Xpdf 4.02 has a vulnerability that leads to a

heap-use-after-free

issue due to incorrect handling of nested Type 3 characters, impacting the

SplashOutputDev::endType3Char

function.

Understanding CVE-2020-25725

In Xpdf 4.02, a flaw in handling Type 3 characters can result in a

heap-use-after-free

problem, affecting the

SplashOutputDev::endType3Char

function.

What is CVE-2020-25725?

The vulnerability in Xpdf 4.02 arises from improper handling of nested Type 3 characters, leading to a

heap-use-after-free

problem in the

SplashOutputDev::endType3Char

function.

The Impact of CVE-2020-25725

The vulnerability has a CVSS base score of 5 (Medium severity) with a high availability impact. It requires user interaction and low privileges to exploit, with a low attack complexity and vector being local.

Technical Details of CVE-2020-25725

Xpdf 4.02 vulnerability details and impact.

Vulnerability Description

Xpdf 4.02 suffers from a

heap-use-after-free

issue due to incorrect handling of nested Type 3 characters.

Affected Systems and Versions

Product: xpdf
Vendor: Glyph & Cog
Version: 4.02

Exploitation Mechanism

The vulnerability occurs when the

t3GlyphStack->cache

is accessed after being freed, leading to a

heap-use-after-free

problem.

Mitigation and Prevention

Protecting systems from CVE-2020-25725.

Immediate Steps to Take

Apply vendor patches promptly to address the vulnerability.
Avoid opening untrusted PDF files to mitigate potential exploitation.

Long-Term Security Practices

Regularly update software and apply security patches to prevent similar vulnerabilities.

Patching and Updates

Check for and apply updates from Glyph & Cog to fix the vulnerability.