CVE-2020-24996 Explained : Impact and Mitigation

Xpdf 4.0.2 has a vulnerability in the function TextString::~TextString() in Catalog.cc, allowing remote attackers to trigger an invalid memory access, leading to a Denial of Service or other impacts.

Understanding CVE-2020-24996

This CVE involves an invalid memory access vulnerability in Xpdf 4.0.2 that can be exploited remotely.

What is CVE-2020-24996?

The vulnerability in Xpdf 4.0.2 allows a remote attacker to exploit an invalid memory access in the TextString::~TextString() function, potentially causing a Denial of Service (Segmentation fault) or other unspecified impacts.

The Impact of CVE-2020-24996

The vulnerability can result in a Denial of Service condition or other unspecified impacts when a crafted PDF file is sent to the pdftohtml binary.

Technical Details of CVE-2020-24996

Xpdf 4.0.2 is affected by an invalid memory access vulnerability in the TextString::~TextString() function.

Vulnerability Description

The vulnerability allows remote attackers to exploit the TextString::~TextString() function, potentially leading to a Denial of Service or other impacts.

Affected Systems and Versions

Product: Xpdf 4.0.2
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability can be triggered by sending a crafted PDF file to the pdftohtml binary, enabling remote attackers to exploit the invalid memory access.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-24996 vulnerability.

Immediate Steps to Take

Apply vendor patches or updates promptly.
Avoid opening PDF files from untrusted sources.
Monitor security mailing lists for any updates related to Xpdf.

Long-Term Security Practices

Implement network segmentation to limit the impact of potential attacks.
Conduct regular security assessments and audits to identify vulnerabilities.

Patching and Updates

Check for patches or updates from Xpdf to address the vulnerability.