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TUCoPS :: Unix :: General :: n-132.txt

Wu-ftpd Buffer Overflow Vulnerability (CIAC N-132)




             __________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                      Wu-ftpd Buffer Overflow Vulnerability
                  [Red Hat Security Advisory RHSA-2003:245-15]

July 31, 2003 18:00 GMT                                           Number N-132
[Revised 13 Aug 2003]
[Revised 14 Aug 2003]
[Revised 5 Sept 2003]
______________________________________________________________________________
PROBLEM:       A buffer overflow vulnerability exists in wu-ftpd versions 
	           2.6.2 and earlier. WU-FTPD is a popular ftp daemon used on the 
               Internet, and on many anonymous ftp sites all around the 
               world. 
PLATFORM:      Red Hat: 
               Linux 7.1, Linux 7.1 for iSeries, Linux 7.1 for pSeries, 
               Linux 7.2, Linux 7.3, Linux 8.0 
	           Sun:     
               Solaris 9, Sun Linux 5.0
			   Hewlett Packard:
               B.11.22, B.11.11, and B.11.00 running wu-ftpd
               OTHER PLATFORMS WILL BE ADDED WHEN VENDOR BULLETINS ARE RELEASED.

DAMAGE:        Successful exploitation could cause a buffer overflow and allow 
               for an increase in privileges. Denial of service attacks may be
               possible.
SOLUTION:      Install updated wu-ftpd packages from Red Hat, or obtain the 
               realpath.patch from the WU-FTPD Development Group web site.
______________________________________________________________________________
VULNERABILITY  The risk is HIGH. A remote attacker could gain root privileges. 
ASSESSMENT:                                                                   
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-132.shtml 
 ORIGINAL BULLETIN:  https://rhn.redhat.com/errata/RHSA-2003-245.html 
 ADDITIONAL LINKS:   iSEC:
		             http://isec.pl/vulnerabilities/isec-0011-wu-ftpd.txt 
                     SUN:
		             http://www.sunsolve.sun.com/pub-cgi/
                            retrieve.pl?doc=fsalert%2F56121&zone_32
                            =category%3Asecurity
		             http://www.sunsolve.sun.com/pub-cgi/retrieve.pl?doc=
			                fsalert%2F56220&zone_32=category%3Asecurity
PATCHES:             WU-FTPD Development Group:
                     realpath.patch for WU-FTPD 2.6.2                     
		             http://www.wu-ftpd.org/
					 
					 ADDITIONAL VENDOR INFORMATION WILL BE ADDED WHEN IT 
		     BECOMES AVAILABLE.
______________________________________________________________________________

Revision History: 8/13/2003 - Added Sun's Alert ID: 56121
		          8/14/2003 - Added Sun's Alert ID: 56220
                   9/5/2003 - Added Hewlett Packard vulnerable systems and added
                              WU-FTPD Development Group Link
				  
[***** Start Red Hat Security Advisory RHSA-2003:245-15 *****]

Updated wu-ftpd packages fix remote vulnerability.

Advisory: RHSA-2003:245-15 
Last updated on: 31-JUL-03 
Affected Products: Red Hat Linux 7.1
Red Hat Linux 7.1 for iSeries
Red Hat Linux 7.1 for pSeries
Red Hat Linux 7.2
Red Hat Linux 7.3
Red Hat Linux 8.0 
CVEs (cve.mitre.org): CAN-2003-0466

Security Advisory 

Details:

Updated wu-ftpd packages are now available that fix a remotely exploitable
security issue.

The wu-ftpd package contains the Washington University FTP (File Transfer
Protocol) server daemon. FTP is a method of transferring files between
computers on a network.

An off-by-one bug has been discovered in versions of wu-ftpd up to and
including 2.6.2. On a vulnerable system, a remote attacker would be able
to exploit this bug to gain root privileges.

Red Hat Linux 7.1 and 7.2 contain a version of wu-ftpd that is affected by
this bug, although it is believed this issue will not be remotely
exploitable due to compiler padding of the buffer targeted for the overflow. 

Red Hat Linux 7.3 and 8.0 contain a version of wu-ftpd that is remotely
exploitable.

Red Hat advises all users of wu-ftpd to upgrade to these erratum packages,
which contain a security patch and is not vulnerable to this issue.

Red Hat would like to thank Wojciech Purczynski and Janusz Niewiadomski of
ISEC Security Research for their responsible disclosure of this issue.

Updated packages:

Red Hat Linux 7.1 

----------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-11.71.1.src.rpm
[ via FTP ] [ via HTTP ]     eaad5f7ffbf2399c13623da2c6ff4e83 
  
i386: 
wu-ftpd-2.6.2-11.71.1.i386.rpm
[ via FTP ] [ via HTTP ]     ecbd80d787844a3ab579e6058b0704c2 
  
Red Hat Linux 7.1 for iSeries 

--------------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-11.71.1.src.rpm
[ via FTP ] [ via HTTP ]     eaad5f7ffbf2399c13623da2c6ff4e83 
  
ppc: 
wu-ftpd-2.6.2-11.71.1.ppc.rpm
[ via FTP ] [ via HTTP ]     cf9324b0e936ffb3aa7a738f26108eb6 
  
Red Hat Linux 7.1 for pSeries 

--------------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-11.71.1.src.rpm
[ via FTP ] [ via HTTP ]     eaad5f7ffbf2399c13623da2c6ff4e83 
  
ppc: 
wu-ftpd-2.6.2-11.71.1.ppc.rpm
[ via FTP ] [ via HTTP ]     cf9324b0e936ffb3aa7a738f26108eb6 
  
Red Hat Linux 7.2 

--------------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-11.72.1.src.rpm
[ via FTP ] [ via HTTP ]     3f526a5e04806d71560c7357189c08fa 
  
i386: 
wu-ftpd-2.6.2-11.72.1.i386.rpm
[ via FTP ] [ via HTTP ]     22ce902ae1255927825bec7a6cbd9a68 
  
ia64: 
wu-ftpd-2.6.2-11.72.1.ia64.rpm
[ via FTP ] [ via HTTP ]     8587632893b8a74580b50cdf1a4923f6 
  
Red Hat Linux 7.3 

--------------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-11.73.1.src.rpm
[ via FTP ] [ via HTTP ]     a25b0c5c9575cfa2e18578b8ec30e7ab 
  
i386: 
wu-ftpd-2.6.2-11.73.1.i386.rpm
[ via FTP ] [ via HTTP ]     3c53df7e43666c6b1dfc6b9bbbe4da06 
  
Red Hat Linux 8.0 

--------------------------------------------------------------------------------
 
SRPMS: 
wu-ftpd-2.6.2-12.src.rpm
[ via FTP ] [ via HTTP ]     dca07c4e90f308b49f8ac6b8d463536f 
  
i386: 
wu-ftpd-2.6.2-12.i386.rpm
[ via FTP ] [ via HTTP ]     d7b8fc5c0f9c0938dbddcea76f8e1e22 
  

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains 
the desired RPMs.

Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0466
http://isec.pl/vulnerabilities/isec-0011-wu-ftpd.txt 

Keywords:

ftpd 

----------------------------------------------------------------------------
The listed packages are GPG signed by Red Hat, Inc. for security. Our 
key is available at:
http://www.redhat.com/solutions/security/news/publickey/#key 
You can verify each package and see who signed it with the following 
command:

rpm --checksig -v filename 

If you only wish to verify that each package has not been corrupted or 
tampered with, examine only the md5sum with the following command:

md5sum filename 

The Red Hat security contact is security@redhat.com. More contact details 
at http://www.redhat.com/solutions/security/news/contact.html 
 
Copyright  2002 Red Hat, Inc. All rights reserved. Search by Google
 
[***** End Red Hat Security Advisory RHSA-2003:245-15 *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Red Hat, Inc.  for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
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    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604
    E-mail:   ciac@ciac.org

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:      http://www.ciac.org/
   Anonymous FTP:       ftp.ciac.org

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
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organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
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