CVE-2021-28021 Explained : Impact and Mitigation
Learn about CVE-2021-28021, a buffer overflow flaw in stb 2.26 via crafted JPEG files. Explore impact, technical details, and mitigation steps for this vulnerability.
A buffer overflow vulnerability in function stbi__extend_receive in stb 2.26 via a crafted JPEG file.
Understanding CVE-2021-28021
This CVE-2021-28021 vulnerability involves a buffer overflow issue in function stbi__extend_receive within stb_image.h in stb 2.26 when processing a specially crafted JPEG file.
What is CVE-2021-28021?
The CVE-2021-28021 is a buffer overflow vulnerability that allows an attacker to execute arbitrary code or crash the application by exploiting the flaw in the stbi__extend_receive function.
The Impact of CVE-2021-28021
If successfully exploited, this vulnerability could lead to remote code execution, denial of service, or other malicious activities by an attacker utilizing a specifically crafted JPEG file.
Technical Details of CVE-2021-28021
This section provides more in-depth technical details about the CVE-2021-28021 vulnerability.
Vulnerability Description
The vulnerability exists in the stbi__extend_receive function within the stb_image.h header file in stb 2.26, triggered by processing a maliciously created JPEG file.
Affected Systems and Versions
The impact of CVE-2021-28021 affects stb 2.26 versions.
Exploitation Mechanism
An attacker can exploit this vulnerability by providing a specially crafted JPEG file to trigger the buffer overflow in the stbi__extend_receive function.
Mitigation and Prevention
To address CVE-2021-28021, consider the following mitigation strategies.
Immediate Steps to Take
- Update the affected software to a patched version as soon as possible.
- Avoid opening or processing untrusted JPEG files from unknown or unverified sources.
Long-Term Security Practices
- Regularly apply security updates and patches to all software components to prevent vulnerabilities.
- Implement network security measures and controls to detect and block malicious activities.
Patching and Updates
Stay informed about security advisories and updates from the software vendor to apply patches promptly and protect systems from potential exploits.