Bug 1599

Summary: Login bug in wu-ftpd-2.4.2b18-2.1
Product: [Retired] Red Hat Linux Reporter: sweeheng
Component: wu-ftpdAssignee: Bernhard Rosenkraenzer <bero>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.2CC: wuftpd-bugs
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: i386   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 1999-08-23 22:29:27 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description sweeheng 1999-03-18 10:06:31 UTC
I am getting a perculiar behaviour from the
wu-ftpd-2.4.2b18-2.1.i386.rpm package downloaded from
updates.redhat.com. It is reproducible for me.

Scenario: I configured /etc/ftpaccess to allow only guest
accounts, ie. no real and anonymous access. I modified the
default ftpaccess file so that the first line reads:
     class guestuser   guest   *

To verify it, I ftp to my machine using various combinations
of real, guest and anonymous accounts. Almost every time it
works - real and anonymous users rejected while guest
admitted if password is right.

I said almost because if I do it in the following sequence,
I can get anonymous access:

1. FTP to machine;
2. Login as a *valid* guest user ("adam" in this example)
     Name(machine-name:someuser): adam <Enter>
     331 Password required for adam.
3. Provide blank/dummy password.
     Password: <Enter>
     530 Login incorrect.
4. Just as one would expect for the wrong password. However,
   immediately login as anonymous.
     ftp> user anonymous <enter>
     331 Guest login ok, send your complete ...<blah>
5. Give some random address.
     Password: someone@out.there <Enter>
     230 Guest login ok, access restriction apply.

Tada! I get anonymous access when I am not supposed to.

Seems like the first login as a valid guest user (but with
the wrong password) sets some flag which subsequently makes
ftpd forget the fact that anonymous access is not allowed.

I believe the wu-ftpd VR14 release have the same problem

Comment 1 Jeff Johnson 1999-06-07 12:24:59 UTC
Commenting out the 1st class line in /etc/ftpaccess and adding
	class guestuser guest *
	guestuser adam
after adding user adam verifies that wu-ftpd-2.4.2vr17-3 has this
behavior also.

Comment 2 Jeff Johnson 1999-08-23 22:29:59 UTC
Fixed in wu-ftpd-2.5.0-5.