CVE-2021-28676 Explained : Impact and Mitigation
Discover the impact of CVE-2021-28676, a vulnerability in Pillow before 8.2.0 allowing an infinite loop in FLI data processing. Learn about affected versions and mitigation steps.
An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.
Understanding CVE-2021-28676
This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-28676.
What is CVE-2021-28676?
CVE-2021-28676 is a vulnerability identified in Pillow before version 8.2.0, specifically affecting the handling of FLI data. The issue could result in an infinite loop during the load process due to inadequate validation of the block advance.
The Impact of CVE-2021-28676
The vulnerability in Pillow could be exploited to trigger an infinite loop when processing FLI data. This could potentially lead to denial of service or other malicious outcomes if manipulated by a threat actor.
Technical Details of CVE-2021-28676
Let's delve deeper into the specifics of the vulnerability.
Vulnerability Description
The vulnerability arises from the failure of FliDecode to properly verify that the block advance is non-zero when handling FLI data, opening up the possibility of an infinite loop.
Affected Systems and Versions
All versions of Pillow before 8.2.0 are affected by this vulnerability due to the insufficient validation in the FliDecode process.
Exploitation Mechanism
An attacker could exploit this vulnerability by crafting a malicious FLI data file that triggers the infinite loop during decoding, leading to a potential denial of service condition or other attacks.
Mitigation and Prevention
Discover the essential steps to protect your systems against CVE-2021-28676.
Immediate Steps to Take
Users are advised to update Pillow to version 8.2.0 or later to mitigate the vulnerability and prevent potential exploitation. It is crucial to apply patches promptly to secure the system.
Long-Term Security Practices
Incorporating secure coding practices, regularly updating software components, and monitoring security advisories are crucial for enhancing the overall cybersecurity posture.
Patching and Updates
Stay informed about security updates and promptly apply patches to address known vulnerabilities and protect systems from potential threats.