CVE-2020-13999 : Exploit Details and Defense Strategies

A vulnerability in libEMF (ECMA-234 Metafile Library) 1.0.12 can lead to denial of service due to an integer overflow when processing malicious EMF files.

Understanding CVE-2020-13999

What is CVE-2020-13999?

ScaleViewPortExtEx in libemf.cpp in libEMF (aka ECMA-234 Metafile Library) 1.0.12 allows an integer overflow and denial of service via a crafted EMF file.

The Impact of CVE-2020-13999

The vulnerability can be exploited by an attacker to cause a denial of service on systems running the affected version of libEMF.

Technical Details of CVE-2020-13999

Vulnerability Description

An integer overflow in ScaleViewPortExtEx in libemf.cpp in libEMF 1.0.12 allows an attacker to trigger a denial of service by providing a specially crafted EMF file.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: 1.0.12 (affected)

Exploitation Mechanism

The vulnerability is exploited by manipulating the ScaleViewPortExtEx function in libemf.cpp with a malicious EMF file, causing an integer overflow and subsequent denial of service.

Mitigation and Prevention

Immediate Steps to Take

Avoid opening EMF files from untrusted or unknown sources.
Implement file type and content validation mechanisms.
Consider using alternative libraries or patches to mitigate the vulnerability.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Conduct security assessments and audits to identify and address vulnerabilities proactively.

Patching and Updates

Apply patches or updates provided by the vendor to address the vulnerability in libEMF.