CVE-2021-29623 : Security Advisory and Response
Learn about CVE-2021-29623, a vulnerability in Exiv2 library versions prior to v0.27.4 allowing memory leaks in crafted image files. Find out about impact, technical details, and mitigation steps.
A read of uninitialized memory was found in Exiv2 versions v0.27.3 and earlier, a C++ library and command-line utility used to manage image metadata. This vulnerability could potentially allow an attacker to leak stack memory when processing a specially crafted image file. Learn more about the impact, technical details, and mitigation steps below.
Understanding CVE-2021-29623
Exiv2, a popular library for image metadata management, contains an uninitialized variable bug that could lead to a disclosure of sensitive stack memory.
What is CVE-2021-29623?
The vulnerability in Exiv2 versions v0.27.3 and prior allows an attacker to read uninitialized memory by manipulating specific image files, potentially leaking a few bytes of stack memory.
The Impact of CVE-2021-29623
If exploited, this vulnerability could be used to extract sensitive information from the memory of affected systems, leading to potential data leaks or further attacks.
Technical Details of CVE-2021-29623
The following technical aspects provide insights into the vulnerability and its implications:
Vulnerability Description
The bug arises when Exiv2 is used to process crafted image files, triggering a read of uninitialized memory that may leak stack memory.
Affected Systems and Versions
Exiv2 versions prior to v0.27.4 are impacted by this vulnerability, leaving systems running these versions susceptible to memory disclosure attacks.
Exploitation Mechanism
An attacker can exploit this bug by convincing a user to open or process a malicious image file using Exiv2, causing the leak of stack memory bytes.
Mitigation and Prevention
To safeguard systems from CVE-2021-29623, consider the following recommendations:
Immediate Steps to Take
Update Exiv2 to version v0.27.4 or later to patch the uninitialized variable bug and eliminate the risk of memory disclosure.
Long-Term Security Practices
Maintain a proactive approach to software security by regularly updating libraries, applications, and systems to prevent known vulnerabilities from being exploited.
Patching and Updates
Stay informed about security advisories and patches released by Exiv2 to address potential vulnerabilities, ensuring timely implementation to enhance system security.