Note: This is an archival copy of Security Sun Alert 200687 as previously published on
Latest version of this security advisory is available from as Sun Alert 1000542.1.
Article ID : 1000542.1
Article Type : Sun Alerts (SURE)
Last reviewed : 2006-12-20
Audience : PUBLIC
Copyright Notice: Copyright © 2010, Oracle Corporation and/or its affiliates.

Security Vulnerability in the WU-FTPD "wu_fnmatch" Function May Result in a Denial of Service (DoS)


Release Phase

Solaris 9 Operating System
Solaris 10 Operating System

Bug Id

Date of Workaround Release

Date of Resolved Release


The Solaris 9 and Solaris 10 FTP Server, in.ftpd(1M), is based on WU-FTPD (Washington University ftpd) and are affected by a security vulnerability in the "wu_fnmatch" function which may allow a local or remote unprivileged user the ability to cause a Denial of Service (DoS) by consuming a large amount of CPU resources.

Additional information on this issue can be found in the following documents:

Contributing Factors

This issue can occur in the following releases:

SPARC Platform

  • Solaris 9 without patch 114564-05
  • Solaris 10 without patch 120085-01

x86 Platform

  • Solaris 9 without patch 114565-05
  • Solaris 10 without patch 120086-01


  1. Solaris 7 and Solaris 8 are not affected by this issue.
  2. This issue only impacts the "WU-FTPD" version of in.ftpd(1M).
  3. This issue only affects systems which are enabled as in.ftpd(1M) servers.


If the described issue occurs, the CPU utilization will go up to 100% and the prstat(1M) command will show that the "in.ftpd" process is consuming a lot of CPU time.

Symptoms similar to the following may be seen:

  • Slow running applications
  • Delayed response from the terminals
  • Slow response over the network


To work around the described issue, disable ftp(1) service by doing the following:

On Solaris 9

1. Login as root.

2. Edit the "/etc/inetd.conf" file and comment out the line starting with "ftp".

3. Tell the inetd(1M) process to reread the newly modified "/etc/inetd.conf" file by sending it a hangup signal, SIGHUP:

    # pkill -HUP inetd

On Solaris 10

1. Login as root.

2. Disable the in.ftpd(1M) server using the following command:

    # svcadm disable ftp


This issue is addressed in the following releases:

SPARC Platform

  • Solaris 9 with patch 114564-05 or later
  • Solaris 10 with patch 120085-01 or later

x86 Platform

  • Solaris 9 with patch 114565-05 or later
  • Solaris 10 with patch 120086-01 or later

Modification History
Date: 23-MAY-2005

Change History


  • Updated Relief/Workaround section


Date: 08-JUN-2005
  • Updated Contributing Factors and Relief/Workaround sections

Date: 06-JUL-2005
  • State: Resolved
  • Updated Contributing Factors and Resolution Sections



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