CVE-2021-27425 : What You Need to Know

Cesanta Software Mongoose-OS v2.17.0 is vulnerable to an integer wrap-around issue in function mm_malloc. This vulnerability allows for arbitrary memory allocation, which can result in unexpected behaviors like crashes or remote code injection/execution.

Understanding CVE-2021-27425

This section provides an overview of the CVE-2021-27425 vulnerability affecting Cesanta Software's Mongoose-OS.

What is CVE-2021-27425?

The CVE-2021-27425 vulnerability exists in Mongoose-OS version 2.17.0 due to an integer overflow or wraparound weakness in the mm_malloc function. It can be exploited to trigger arbitrary memory allocation leading to critical security risks.

The Impact of CVE-2021-27425

With a CVSS v3.1 base score of 7.3, this vulnerability poses a high severity risk. Attackers can potentially exploit this issue to execute remote code or cause system crashes, compromising the integrity and availability of affected systems.

Technical Details of CVE-2021-27425

This section delves into the technical aspects of CVE-2021-27425, including its vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability in Cesanta Software Mongoose-OS v2.17.0 arises from an integer wrap-around flaw in the mm_malloc function. This flaw allows for improper memory allocation, paving the way for unpredictable behavior such as crashes or remote code injection.

Affected Systems and Versions

The affected product is Mongoose-OS by Cesanta Software, specifically version 2.17.0. Users of this version are urged to take immediate action to mitigate the security risks associated with this vulnerability.

Exploitation Mechanism

Exploiting this vulnerability involves manipulating the integer wrap-around flaw in the mm_malloc function to trigger arbitrary memory allocation. This can be leveraged by threat actors to execute remote code or disrupt system operations.

Mitigation and Prevention

In response to CVE-2021-27425, users are advised to implement immediate steps for mitigation, enhance long-term security practices, and prioritize patching and updates.

Immediate Steps to Take

Users should apply the provided Cesanta Software Mongoose update to address the vulnerability promptly. Additionally, it is crucial to monitor system activity for signs of exploitation and take necessary precautions.

Long-Term Security Practices

To bolster overall security posture, organizations should adopt robust security measures, conduct regular security assessments, and stay informed about potential vulnerabilities in their software stack.

Patching and Updates

Regularly updating software components is essential to patch known vulnerabilities and protect systems from evolving threats. Users should stay vigilant for security advisories and apply patches promptly to ensure system integrity and resilience.