CVE-2021-42624 : Exploit Details and Defense Strategies

A local buffer overflow vulnerability exists in the latest version of Miniftpd, allowing a crafted payload to be sent to the affected function.

Understanding CVE-2021-42624

This CVE identifies a local buffer overflow vulnerability in Miniftpd, impacting its latest version.

What is CVE-2021-42624?

The vulnerability in Miniftpd allows malicious actors to exploit a buffer overflow issue by sending a specifically crafted payload to the affected function.

The Impact of CVE-2021-42624

This vulnerability could lead to arbitrary code execution or denial of service by an attacker with local access to the affected system.

Technical Details of CVE-2021-42624

Miniftpd in ftpproto.c is prone to buffer overflow due to improper validation of user-supplied data.

Vulnerability Description

The vulnerability arises from an unchecked input size in the tmp variable within the Miniftpd code, enabling a buffer overflow via a crafted payload.

Affected Systems and Versions

Affected Version: Latest version of Miniftpd

Exploitation Mechanism

Attackers can leverage the buffer overflow by sending a specifically crafted payload to the affected function in Miniftpd.

Mitigation and Prevention

To address CVE-2021-42624, follow these steps:

Immediate Steps to Take

Disable or restrict access to the vulnerable system
Implement network-level protections to minimize the risk of exploitation
Monitor network traffic for any suspicious activities

Long-Term Security Practices

Regularly update and patch Miniftpd to mitigate known vulnerabilities
Conduct regular security assessments and code reviews to identify and address potential security flaws

Patching and Updates

Apply patches provided by the Miniftpd vendor to fix the buffer overflow vulnerability