CVE-2021-32625 : What You Need to Know
Discover the impact of CVE-2021-32625, a high-risk Redis vulnerability allowing remote code execution. Learn about affected versions, technical details, and mitigation steps.
A detailed overview of the Redis vulnerability in STRALGO LCS on 32-bit systems, affecting versions less than 6.0.14 and between 6.2.0 to 6.2.4.
Understanding CVE-2021-32625
This section provides insights into the vulnerability, its impact, technical details, and mitigation steps.
What is CVE-2021-32625?
Redis, an open-source in-memory data store, experienced an integer overflow bug in versions 6.0 or newer. Exploitable via the STRALGO LCS command, the bug could lead to heap corruption and potential remote code execution. The issue was rectified in versions 6.2.4 and 6.0.14.
The Impact of CVE-2021-32625
The vulnerability poses a high risk with a CVSS base score of 7.5, affecting confidentiality, integrity, and availability. It requires low privileges for exploitation over a network without user interaction.
Technical Details of CVE-2021-32625
Gain insights into the vulnerability's description, affected systems, and exploitation mechanism.
Vulnerability Description
The flaw stems from an integer overflow to buffer overflow, allowing attackers to execute arbitrary code by corrupting the heap.
Affected Systems and Versions
Redis versions below 6.0.14 and between 6.2.0 to 6.2.4 are vulnerable to exploitation via the STRALGO LCS command.
Exploitation Mechanism
Attackers can leverage the STRALGO LCS command to trigger the integer overflow, leading to heap corruption and potential remote code execution.
Mitigation and Prevention
Explore immediate steps and long-term security practices to safeguard systems from CVE-2021-32625.
Immediate Steps to Take
To mitigate the vulnerability, update Redis to version 6.2.4 or 6.0.14. Alternatively, configure ACL to restrict clients from using the STRALGO LCS command.
Long-Term Security Practices
Implement secure coding practices, conduct regular security audits, and stay informed about Redis security advisories.
Patching and Updates
Regularly monitor and apply security patches released by Redis to address known vulnerabilities and enhance system security.