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>>                                                      CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl.  Links  <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>>                                                                           <<
>> CERT-NL also has stopped the CERT-CC-Mirror service.  Due to this the     <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the  <<
>> complete CERT-CC advisory texts:                     http://www.cert.org  <<
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Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : CERT-NL (Erik-Jan Bos)                      Index  :    S-93-11
Distribution  : World                                       Page   :          1
Classification: External                                    Version:      Final
Subject       : wuarchive ftpd Vulnerability                Date   :  11-Apr-93
===============================================================================

CERT-NL received information from CERT Coordination Center who has
received information concerning a vulnerability in versions of
wuarchive ftpd available before April 8, 1993. Vulnerable wuarchive
ftpd versions were available from
wuarchive.wustl.edu:/packages/ftpd.wuarchive.shar and many other
anonymous FTP sites.

We strongly recommend that any site using versions of wuarchive ftpd 
dating prior to April 8, 1993, immediately take corrective action or 
remove this service.

- ---------------------------------------------------------------------------

I.   Description

     A vulnerability exists in the access control mechanism in this 
     version of ftpd.

     
II.  Impact

     Anyone (remote or local) can potentially gain access to any 
     account including root on a host running this version of ftpd.


III. Solution 

     Affected sites may choose to disable anonymous FTP service until
     they have corrected this problem.
        
     Affected sites can correct this problem through one of the
     following two procedures:

     A. A new version of ftpd has been released that provides new features
        and also fixes this security problem.  Sites can obtain this new 
        version via anonymous FTP from wuarchive.wustl.edu (128.252.135.4). 
        The files are located in:

                                                      Size      Checksum
        /packages/wuarchive-ftpd/wu-ftpd-2.0.shar    421953      08786
        /packages/wuarchive-ftpd/wu-ftpd-2.0.tar     491520      27466

     B. Make modifications to your existing wuarchive ftpd sources using
        the diff output provided below, recompile and install according to 
        the instructions provided. 

*** ftpd.c.orig
- --- ftpd.c
***************
*** 413,418 ****
- --- 413,420 ----
                end_login();
        }
  
+       anonymous = 0;
+ 
        if (!strcasecmp(name, "ftp") || !strcasecmp(name, "anonymous")) {
                if (checkuser("ftp") || checkuser("anonymous")) {
                        reply(530, "User %s access denied.", name);

- ---------------------------------------------------------------------------

The CERT Coordination Center wishes to thank Scott Paisley, Computer Systems 
Support Manager, Factory Automated Systems Division, N.I.S.T., for informing 
us of this vulnerability.  We would also like to thank Chris Myers, Washington
University, for his quick response to this problem.

CERT-NL wishes to thank CERT Coordination Center for bringing the
information regarding this vulnerability to our attention.

- ---------------------------------------------------------------------------

==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
  http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL  (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

   Email:     cert-nl@surfnet.nl     ATTENDED REGULARLY ALL DAYS
   Phone:     +31 302 305 305        BUSINESS HOURS ONLY
   Fax:       +31 302 305 329        BUSINESS HOURS ONLY
   Snailmail: SURFnet bv
              Attn. CERT-NL
              P.O. Box 19035
              NL - 3501 DA  UTRECHT
              The Netherlands

NOODGEVALLEN:    06 22 92 35 64      ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64      ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
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