CVE-2021-3482 : Vulnerability Insights and Analysis

A heap-based buffer overflow vulnerability has been discovered in Exiv2 versions up to and including 0.27.4-RC1. This vulnerability exists in the Jp2Image::readMetadata() function in jp2image.cpp due to improper input validation of the rawData.size property. An attacker can exploit this flaw by providing a malicious JPG image with crafted EXIF data.

Understanding CVE-2021-3482

This CVE identifies a critical vulnerability in the Exiv2 software that could allow an attacker to trigger a heap-based buffer overflow using a specially crafted JPG image.

What is CVE-2021-3482?

CVE-2021-3482 is a security vulnerability found in Exiv2 versions prior to 0.27.4-RC1. The flaw originates from inadequate input validation of a specific property in the Jp2Image::readMetadata() function, leading to a potential heap-based buffer overflow.

The Impact of CVE-2021-3482

The impact of this vulnerability is severe as it allows a threat actor to execute arbitrary code or cause a denial of service (DoS) condition on systems running the affected Exiv2 versions. By exploiting this issue, an attacker could compromise the integrity and confidentiality of the system.

Technical Details of CVE-2021-3482

This section delves deeper into the vulnerability's technical aspects.

Vulnerability Description

The vulnerability in Exiv2 versions before and including 0.27.4-RC1 results from improper input validation of the rawData.size property in Jp2Image::readMetadata() in jp2image.cpp. This oversight enables a crafted JPG image with malicious EXIF data to trigger a heap-based buffer overflow.

Affected Systems and Versions

Exiv2 versions up to and including 0.27.4-RC1 are affected by this vulnerability. Systems running these versions are at risk of exploitation and should apply appropriate patches immediately.

Exploitation Mechanism

An attacker can exploit CVE-2021-3482 by providing a specially crafted JPG image containing malicious EXIF data. By manipulating the rawData.size property in Jp2Image::readMetadata(), the attacker can trigger a heap-based buffer overflow.

Mitigation and Prevention

To safeguard systems from CVE-2021-3482, immediate actions and long-term security practices should be implemented.

Immediate Steps to Take

Apply the latest security patches provided by Exiv2 to address this vulnerability.
Restrict access to vulnerable systems and ensure network security controls are in place.

Long-Term Security Practices

Regularly update Exiv2 and other software components to the latest versions to mitigate known vulnerabilities.
Maintain robust security practices, including conducting security assessments and implementing secure coding standards.

Patching and Updates

Stay informed about security updates from Exiv2 and other relevant sources to promptly address emerging vulnerabilities and protect your systems.