CVE-2021-46661 Explained : Impact and Mitigation

MariaDB through 10.5.9 allows an application crash in find_field_in_tables and find_order_in_list via an unused common table expression (CTE).

Understanding CVE-2021-46661

This CVE involves a specific vulnerability in MariaDB that can lead to a crash in certain functions.

What is CVE-2021-46661?

The vulnerability in MariaDB through version 10.5.9 triggers an application crash due to an issue in how specific functions handle unused common table expressions (CTEs).

The Impact of CVE-2021-46661

The vulnerability can be exploited to cause application crashes, potentially leading to a denial of service (DoS) condition for systems running the affected versions of MariaDB.

Technical Details of CVE-2021-46661

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability stems from improper handling of common table expressions, specifically in functions like find_field_in_tables and find_order_in_list within MariaDB.

Affected Systems and Versions

MariaDB versions up to 10.5.9 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting SQL queries that involve common table expressions in a way that triggers the application crash.

Mitigation and Prevention

It is crucial to take immediate steps to address the CVE and implement long-term security practices to prevent similar issues.

Immediate Steps to Take

Update MariaDB to a patched version that addresses the vulnerability.
Monitor and restrict SQL queries that involve complex CTEs to minimize the risk of exploitation.

Long-Term Security Practices

Regularly update database software to ensure all security patches are applied promptly.
Conduct security audits to identify and mitigate potential vulnerabilities in database configurations.

Patching and Updates

Stay informed about security advisories from MariaDB and apply patches as soon as they are available to protect against known vulnerabilities.