CVE-2020-14149 : Exploit Details and Defense Strategies

In uftpd before 2.12, handle_CWD in ftpcmd.c mishandled the path provided by the user, causing a NULL pointer dereference and denial of service, as demonstrated by a CWD /.. command.

Understanding CVE-2020-14149

In this CVE, a vulnerability in uftpd before version 2.12 leads to a denial of service due to mishandling of user-provided paths.

What is CVE-2020-14149?

The vulnerability in uftpd before 2.12 allows for a NULL pointer dereference and denial of service when processing user-provided paths.

The Impact of CVE-2020-14149

The exploitation of this vulnerability can result in a denial of service, potentially disrupting the availability of the affected system.

Technical Details of CVE-2020-14149

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

Vulnerability Description

The issue arises from the mishandling of paths provided by users in the handle_CWD function in ftpcmd.c, leading to a NULL pointer dereference.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

Exploitation occurs when a malicious actor sends a specifically crafted CWD /.. command to trigger the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2020-14149 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update uftpd to version 2.12 or newer to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement proper input validation mechanisms to prevent similar vulnerabilities.
Regularly update and patch software to address known security issues.

Patching and Updates

Ensure timely installation of patches and updates to keep systems secure against known vulnerabilities.