CVE-2021-20515 : What You Need to Know

IBM Informix Dynamic Server 14.10 is vulnerable to a stack-based buffer overflow, allowing a local privileged user to execute arbitrary code or create a denial of service scenario.

Understanding CVE-2021-20515

This section will cover the details, impact, technical aspects, and mitigation strategies related to CVE-2021-20515.

What is CVE-2021-20515?

CVE-2021-20515 pertains to a vulnerability in IBM Informix Dynamic Server 14.10, leading to a stack-based buffer overflow due to insufficient bounds checking. This flaw enables a local privileged user to execute arbitrary code on the system or trigger a denial of service event.

The Impact of CVE-2021-20515

The vulnerability poses a medium-risk threat, with a CVSS v3.0 base score of 6.7. It has a high impact on confidentiality, integrity, and availability, requiring high privileges for exploitation, albeit with unproven exploit code maturity.

Technical Details of CVE-2021-20515

This section will delve into the vulnerability description, affected systems/versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from a lack of proper bounds checking in IBM Informix Dynamic Server 14.10, allowing a local privileged user to overflow a buffer and potentially execute arbitrary code or disrupt services.

Affected Systems and Versions

IBM Informix Dynamic Server version 14.1 is affected by this vulnerability, with other versions possibly being susceptible to similar issues.

Exploitation Mechanism

A local privileged user can exploit the lack of bounds checking to overflow a buffer, leading to execution of unauthorized code or causing denial of service scenarios.

Mitigation and Prevention

In this section, you will find immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

Users are advised to apply the official fix provided by IBM promptly to mitigate the risk of exploitation. Additionally, restrict access and privileges for local users to minimize potential threats.

Long-Term Security Practices

Implement stringent access controls, regular security assessments, and employee training to enhance overall security posture and prevent unauthorized access or attacks.

Patching and Updates

Regularly monitor IBM's security bulletins and ensure timely installation of patches and updates to address vulnerabilities like CVE-2021-20515.