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CVE-2020-5204 : Exploit Details and Defense Strategies

Learn about CVE-2020-5204, a buffer overflow vulnerability in uftpd before 2.11. Discover impact, affected systems, exploitation, and mitigation steps to secure your systems.

In uftpd before 2.11, a buffer overflow vulnerability exists in handle_PORT in ftpcmd.c due to a buffer being filled with user input using the format specifier %d. This vulnerability has been assigned CVE-2020-5204.

Understanding CVE-2020-5204

This CVE pertains to a buffer overflow vulnerability in the uftpd software.

What is CVE-2020-5204?

The vulnerability in uftpd before version 2.11 allows for a buffer overflow in the handle_PORT function, potentially leading to security issues.

The Impact of CVE-2020-5204

The CVSS v3.1 base score for this vulnerability is 6.5, indicating a medium severity issue with low impact on confidentiality, integrity, and availability.

Technical Details of CVE-2020-5204

This section covers the technical aspects of the CVE.

Vulnerability Description

The buffer overflow vulnerability in uftpd before 2.11 is caused by user input exceeding the buffer size allocated for IPv4 addresses.

Affected Systems and Versions

        Product: uftpd
        Vendor: troglobit
        Versions Affected: < 2.11

Exploitation Mechanism

The vulnerability arises from the use of the %d format specifier allowing more than 3 digits, leading to a buffer overflow.

Mitigation and Prevention

Protecting systems from the CVE-2020-5204 vulnerability is crucial.

Immediate Steps to Take

        Update uftpd to version 2.11 or newer to mitigate the buffer overflow issue.
        Monitor vendor advisories and security announcements for patches and updates.

Long-Term Security Practices

        Implement input validation mechanisms to prevent buffer overflows.
        Conduct regular security assessments and audits to identify and address vulnerabilities.

Patching and Updates

        Apply patches and updates provided by the vendor promptly to address security vulnerabilities.

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