Bug 820876 - vsftpd DNS lookup cannot be disabled
Summary: vsftpd DNS lookup cannot be disabled
Status: CLOSED DUPLICATE of bug 752954
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: vsftpd
Version: 6.2
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Jiri Skala
QA Contact: BaseOS QE Security Team
Depends On:
TreeView+ depends on / blocked
Reported: 2012-05-11 09:30 UTC by Sebastien Caps
Modified: 2014-11-09 22:35 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-05-11 10:15:57 UTC
Target Upstream Version:

Attachments (Terms of Use)

Description Sebastien Caps 2012-05-11 09:30:33 UTC
Description of problem:
vsftpd DNS lookup cannot be disabled.
This bug have been resolv in 5.x with the option 'reverse_lookup_enable'
but in 6.2 this option is no longer available

https://rhn.redhat.com/errata/RHBA-2009-1282.html :
* the DNS reverse lookup feature was implemented without any way to disable
it. This update contains the parameter 'reverse_lookup_enable', which
allows users to enable or disable the DNS reverse lookup functionality.
Version-Release number of selected component (if applicable):
rpm -qi vsftpd
Name : vsftpd Relocations: (not relocatable)
Version : 2.2.2 
Release : 6.el6_2.1

How reproducible:
Steps to Reproduce:
1. having 2(or more) nameserver in /etc/resolv.conf that is NOT reachable
2. and then try to connect to the ftp server.
Actual results:
Connection timed out

Expected results:
Connection succesfull

Additional info:
trying with "reverse_lookup_enable=NO"
service vsftpd restart
Shutting down vsftpd: [FAILED]
Starting vsftpd for vsftpd: 500 OOPS: unrecognised variable in config file: reverse_lookup_enable

Comment 2 Jiri Skala 2012-05-11 10:15:57 UTC
The fix will be available in the next update 6.3.

*** This bug has been marked as a duplicate of bug 752954 ***

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