CVE-2021-32627 : Vulnerability Insights and Analysis

Redis is an open-source, in-memory database that persists on disk. The vulnerability involves an integer overflow bug that, in affected versions, can be exploited to corrupt the heap, potentially resulting in remote code execution. Learn more about CVE-2021-32627 below.

Understanding CVE-2021-32627

This section provides insights into the details of the CVE-2021-32627 vulnerability affecting Redis.

What is CVE-2021-32627?

The CVE-2021-32627 vulnerability in Redis allows attackers to exploit an integer overflow bug, leading to heap corruption and potentially granting the ability for remote code execution. By manipulating specific configuration parameters and crafting large stream elements, attackers can take advantage of this security flaw.

The Impact of CVE-2021-32627

The impact of this vulnerability is rated as HIGH. The attack complexity is considered HIGH with a NETWORK attack vector. It affects the availability, confidentiality, and integrity of the system, with LOW privileges required for exploitation.

Technical Details of CVE-2021-32627

In this section, the technical aspects of CVE-2021-32627, including vulnerability description, affected systems, and exploitation mechanisms, are discussed.

Vulnerability Description

The vulnerability arises from an integer overflow issue that allows attackers to corrupt the heap and potentially execute remote code by manipulating specific Redis configuration parameters.

Affected Systems and Versions

The CVE-2021-32627 vulnerability impacts Redis versions >= 5.0.0 and < 5.0.14, >= 6.0.0 and < 6.0.16, and >= 6.2.0 and < 6.2.6.

Exploitation Mechanism

Exploiting this vulnerability involves setting specific configuration parameters to large values and constructing specially crafted stream elements to trigger the integer overflow bug.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of CVE-2021-32627.

Immediate Steps to Take

For immediate mitigation, users are advised to upgrade to Redis versions 6.2.6, 6.0.16, or 5.0.14. Alternatively, preventing users from modifying the proto-max-bulk-len configuration parameter using Access Control Lists (ACLs) can help mitigate the issue.

Long-Term Security Practices

Implementing secure coding practices, regularly updating Redis, and monitoring for security advisories can enhance long-term security.

Patching and Updates

Regularly patching Redis to the latest secure versions is crucial to protect against CVE-2021-32627.