CVE-2004-1602 Scanner

ProFTPD is a widely used open-source FTP server software implemented across various platforms, including Unix-like systems and Windows. Known for its simple setup and configuration flexibility, it serves small businesses to large enterprises. Companies utilize ProFTPD to facilitate secure file transfer and storage, maintaining data integrity. Its widespread popularity makes it a common target for both administrators managing servers and attackers seeking vulnerabilities. ProFTPD offers numerous configuration options to adapt to different security requirements. This adaptability ensures that it remains a relevant choice for a wide range of file transfer needs.

The Username Enumeration vulnerability in ProFTPD 1.2.x series allows attackers to infer valid usernames by analyzing response times. This timing attack exploits the server's varying reply speeds when queried with existing versus non-existing usernames. Attackers leverage this difference to enumerate valid user accounts, which can be the first step towards more destructive attacks. The vulnerability arises from inadequate response-time control, exposing sensitive information unintentionally. Such flaws in authentication mechanisms can undermine overall security posture. Understanding and mitigating these risks is crucial for protecting systems against unauthorized access.

ProFTPD's vulnerability lies in its handling of usernames during login attempts, specifically when attackers can discern valid usernames through response time discrepancies. When the server receives a valid username, it processes the request differently, resulting in a measurable delay compared to invalid usernames. This delay allows attackers to build a list of legitimate users by systematically testing various username inputs. The attack does not require valid credentials, relying solely on timing analysis. As a result, it can be performed anonymously and from remote locations, increasing its risk profile. Mitigating this issue involves implementing consistent response times across authentication attempts.

When malicious actors exploit the Username Enumeration vulnerability, they can gain insights into user accounts, potentially facilitating brute-force attacks or social engineering schemes. Identifying valid usernames is a crucial step in compromising accounts, as it narrows down the attack surface. The increased likelihood of unauthorized access escalates the threat to sensitive data and system resources. Additionally, the ability to remotely conduct this enumeration without visible traces complicates detection efforts. Organizations may face reputational damage, loss of customer trust, and potential legal consequences. Addressing the vulnerability promptly is essential to prevent such adverse outcomes.

REFERENCES

• http://marc.info/?l=bugtraq&m=109786760926133&w=2
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17724