Critical Vulnerability in ProFTPD: CVE-2006-6171 Exposes Systems to Unauthorized Access

proftpd Updated 02 Oct 2025

Summary

21/11/2006
N/A
Yes i
Unrated
Not published

DSA-1218-1: proftpd. Affects proftpd versions < 1.2.10-15sarge2. Fixed in 1.2.10-15sarge2. How to fix ↓

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Background

ProFTPD is an open-source FTP server software that is widely used for file transfer over the Internet. It is known for its flexibility and configurability, allowing users to set up secure file transfer protocols. However, like many software packages, it can be susceptible to vulnerabilities that may compromise system security. The vulnerability identified as CVE-2006-6171 affects ProFTPD versions prior to 1.2.10-15sarge2, potentially allowing unauthorized access to sensitive data.

Vulnerability Detail

The vulnerability, CVE-2006-6171, originates from a flaw in the ProFTPD server that can be exploited by attackers to gain unauthorized access to the system. This issue arises from improper handling of certain requests, which may allow an attacker to bypass authentication mechanisms. The ramifications of this vulnerability are severe, as it could lead to unauthorized file access, data breaches, and potential system compromise. It is crucial for users of affected versions to address this vulnerability promptly to safeguard their systems.

How To Fix

Minimum fixed version

1.2.10-15sarge2

This is the first release that contains the fix.

sudo apt-get install --only-upgrade proftpd

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Workaround

As a temporary workaround, users can restrict access to the ProFTPD server by implementing stricter firewall rules or by disabling anonymous access until the package can be updated. This can be done by modifying the ProFTPD configuration file to limit user permissions.

Conclusion

The vulnerability CVE-2006-6171 in ProFTPD poses a significant risk to systems running affected versions. Users are strongly advised to update to the patched version to mitigate potential security threats. Implementing temporary workarounds can help reduce risk until the update is applied.

See every vulnerability recorded for proftpd →

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FAQ

CVE-2006-6171 is a vulnerability in ProFTPD that allows unauthorized access due to improper request handling.

You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.

Failure to fix this vulnerability could lead to unauthorized access to sensitive files and potential system compromise.

Yes, you can implement stricter firewall rules and disable anonymous access as a temporary measure.

It is recommended to regularly check for vulnerabilities, ideally on a monthly basis, to ensure your software remains secure.

Related vulnerabilities

Recent vulnerabilities recorded for proftpd.

How To Fix

Minimum fixed version

1.2.10-15sarge2

This is the first release that contains the fix.

sudo apt-get install --only-upgrade proftpd

Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →

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