CVE-2021-32628 : Security Advisory and Response
Discover the details of CVE-2021-32628, a high-severity vulnerability in Redis that allows remote code execution. Learn about the impact, affected systems, exploitation, and mitigation strategies.
Redis, an open-source in-memory database, contains an integer overflow bug in the ziplist data structure. Exploiting this bug can lead to heap corruption and potential remote code execution. Read on to understand the impact, technical details, and mitigation strategies related to CVE-2021-32628.
Understanding CVE-2021-32628
This section provides insights into the nature of the vulnerability and its implications.
What is CVE-2021-32628?
The CVE-2021-32628 vulnerability involves an integer overflow bug in Redis, affecting all versions. By manipulating ziplist configuration parameters and creating specially crafted commands, attackers can corrupt the heap leading to potential code execution.
The Impact of CVE-2021-32628
The vulnerability has a high severity score of 7.5 out of 10 (CVSS v3.1). With a high attack complexity and impact on confidentiality, integrity, and availability, it poses a significant risk to affected systems.
Technical Details of CVE-2021-32628
Delve deeper into the technical aspects of the vulnerability to understand how it can be exploited.
Vulnerability Description
The vulnerability arises from the manipulation of ziplist configuration parameters, allowing the construction of large ziplists and eventual heap corruption.
Affected Systems and Versions
Redis versions >= 6.2.0 and < 6.2.6, >= 6.0.0 and < 6.0.16, and < 5.0.14 are known to be impacted by this vulnerability.
Exploitation Mechanism
Attackers can leverage the bug by setting ziplist configuration parameters to large values and crafting malicious commands to trigger heap corruption.
Mitigation and Prevention
Explore the necessary steps to mitigate the risk posed by CVE-2021-32628 and safeguard your systems.
Immediate Steps to Take
Update affected Redis instances to versions 6.2.6, 6.0.16, or 5.0.14 to patch the vulnerability. Alternatively, restrict user access to ziplist configuration parameters using ACL.
Long-Term Security Practices
Implement security best practices, such as regular security audits and maintaining updated Redis versions, to prevent similar vulnerabilities.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by Redis to address known vulnerabilities.