Original issue date: April 9, 1993<BR>
Last revised: September 19, 1997<BR>
Attached copyright statement

<P>A complete revision history is at the end of this file.

<P>The CERT Coordination Center 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.

<P>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.

<P><HR>

<P>
<H2>I. Description</H2>

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

<P>
<H2>II. Impact</H2>

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

<P>
<H2>III. Solution </H2>

<P>Affected sites may choose to disable anonymous FTP service until
they have corrected this problem.

<P>Affected sites can correct this problem through one of the
following two procedures:

<P>
<OL>
<H3><LI TYPE="A"></H3>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:

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

<P>
<H3><LI></H3>Make modifications to your existing wuarchive ftpd sources using
the diff output provided below, recompile and install according to 
the instructions provided. 

<P><PRE>
*** 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);
</PRE>

<P>
</OL>
<HR>
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.

<!--#include virtual="/include/footer_nocopyright.html" -->
<P>Copyright 1993 Carnegie Mellon University.</P>

<HR>

Revision History
<PRE>
September 19, 1997  Attached Copyright Statement
</PRE>