CVE-2021-42715 : What You Need to Know

A vulnerability in stb_image.h versions 1.33 through 2.27 could lead to denial of service attacks. Find out the impact, affected systems, and mitigation steps.

Understanding CVE-2021-42715

An issue was discovered in stb stb_image.h 1.33 through 2.27 where the HDR loader parsed truncated end-of-file RLE scanlines as an infinite sequence of zero-length runs. This could potentially result in denial of service attacks in applications using stb_image by submitting crafted HDR files.

What is CVE-2021-42715?

The vulnerability in stb_image.h versions 1.33 through 2.27 allows an attacker to cause denial of service by submitting specifically created HDR files that trigger the issue.

The Impact of CVE-2021-42715

Attackers can exploit this vulnerability to cause denial of service in applications utilizing stb_image
Crafted HDR files submitted by an attacker can trigger this vulnerability

Technical Details of CVE-2021-42715

The following technical details outline the vulnerability, affected systems, and exploitation mechanisms

Vulnerability Description

The HDR loader in stb_image.h 1.33 through 2.27 processes truncated end-of-file RLE scanlines as an infinite sequence of zero-length runs, potentially leading to denial of service.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: 1.33 through 2.27

Exploitation Mechanism

Attackers can exploit the vulnerability by submitting specially crafted HDR files to applications using stb_image, causing denial of service.

Mitigation and Prevention

Protect systems from CVE-2021-42715 with immediate actions and long-term security practices

Immediate Steps to Take

Apply the latest patches provided by the vendor or project maintainers
Avoid opening HDR files from untrusted sources
Monitor vendor advisories for updates and apply them promptly

Long-Term Security Practices

Regularly update software and libraries to the latest versions
Implement secure coding practices to handle file formats securely
Conduct security assessments and code reviews to detect vulnerabilities early

Patching and Updates

Keep stb_image.h up to date with the latest version to prevent exploitation of this vulnerability