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		   Caldera Systems, Inc.  Security Advisory

Subject:		buffer overflow in wu-ftpd-2.5
Advisory number: 	CSSA-1999-2.3:001.0
Issue date: 		1999 August, 25
Cross reference:
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1. Problem Description

   There is a buffer overflow in wu-ftpd-2.5, which can be used by a
   remote attacker to gain super user privilege. If you have anonymous
   FTP enabled, this means that anybody who can reach your machine
   from the Internet can take it over.

   If you have anonymous FTP disabled, this hole can still be exploited
   by users with an account on your machine to obtain root privilege.

2. Vulnerable Versions

   Systems : COL 2.3
   Packages: previous to wu-ftpd-2.5-2 

3. Solutions

   Workarounds:

	If you do not need to offer FTP service to anyone, simply remove the
	FTP server package using

	rpm -e wu-ftpd

	If you want to offer FTP service to local users, but do not need 
	anonymous FTP, you can disable anonymous FTP by adding the user 
	name `ftp' to the file /etc/ftpusers:

	echo ftp >> /etc/ftpusers

	Note that local users may still breach security with this setup.

   The proper solution is to upgrade to the latest packages

	rpm -U wu-ftpd-2.5-2.i386.rpm
	
4. Location of Fixed Packages

   The upgrade packages can be found on Caldera's FTP site at:

   ftp://ftp.calderasystems.com/pub/OpenLinux/updates/2.3/current/RPMS/

   The corresponding source code package can be found at:

   ftp://ftp.calderaystems.com/pub/OpenLinux/updates/2.3/current/SRPMS/

5. Installing Fixed Packages

   Upgrade the affected packages with the following commands:

        rpm -U wu-ftpd-2.5-2.i386.rpm
        
6. Verification

   b43db0110323aba3ab17daa1a2b5bbd6  RPMS/wu-ftpd-2.5.0-2.i386.rpm
   23d39b4842dc985a5413874de97f9bc9  SRPMS/wu-ftpd-2.5.0-2.src.rpm

7. References

   This and other Caldera security resources are located at:

   http://www.calderasystems.com/news/security/index.html

   This security fix closes Caldera's internal Problem Report 5091

8. Disclaimer
   Caldera Systems, Inc. is not responsible for the misuse of any of the
   information we provide on this website and/or through our security
   advisories. Our advisories are a service to our customers intended to
   promote secure installation and use of Caldera OpenLinux.

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