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Red Hat Linux Advisory: wu-ftpd

Jul 31, 2003, 20:54 (1 Talkback[s])

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Red Hat Security Advisory

Synopsis: Updated wu-ftpd packages fix remote vulnerability.
Advisory ID: RHSA-2003:245-01
Issue date: 2003-07-31
Updated on: 2003-07-31
Product: Red Hat Linux
Keywords: ftpd
Cross references:  
Obsoletes: RHSA-2001:157
CVE Names: CAN-2003-0466

1. Topic:

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

2. Relevant releases/architectures:

Red Hat Linux 7.1 - i386
Red Hat Linux 7.1 for iSeries (64 bit) - ppc
Red Hat Linux 7.1 for pSeries (64 bit) - ppc
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386

3. Problem description:

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.

4. 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:


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

5. RPMs required:

Red Hat Linux 7.1:



Red Hat Linux 7.1 for iSeries (64 bit):



Red Hat Linux 7.1 for pSeries (64 bit):



Red Hat Linux 7.2:




Red Hat Linux 7.3:



Red Hat Linux 8.0:



6. Verification:

MD5 sum Package Name

eaad5f7ffbf2399c13623da2c6ff4e83 7.1/en/os/SRPMS/wu-ftpd-2.6.2-11.71.1.src.rpm
ecbd80d787844a3ab579e6058b0704c2 7.1/en/os/i386/wu-ftpd-2.6.2-11.71.1.i386.rpm
eaad5f7ffbf2399c13623da2c6ff4e83 7.1/en/os/iSeries/SRPMS/wu-ftpd-2.6.2-11.71.1.src.rpm
cf9324b0e936ffb3aa7a738f26108eb6 7.1/en/os/iSeries/ppc/wu-ftpd-2.6.2-11.71.1.ppc.rpm
eaad5f7ffbf2399c13623da2c6ff4e83 7.1/en/os/pSeries/SRPMS/wu-ftpd-2.6.2-11.71.1.src.rpm
cf9324b0e936ffb3aa7a738f26108eb6 7.1/en/os/pSeries/ppc/wu-ftpd-2.6.2-11.71.1.ppc.rpm
3f526a5e04806d71560c7357189c08fa 7.2/en/os/SRPMS/wu-ftpd-2.6.2-11.72.1.src.rpm
22ce902ae1255927825bec7a6cbd9a68 7.2/en/os/i386/wu-ftpd-2.6.2-11.72.1.i386.rpm
8587632893b8a74580b50cdf1a4923f6 7.2/en/os/ia64/wu-ftpd-2.6.2-11.72.1.ia64.rpm
a25b0c5c9575cfa2e18578b8ec30e7ab 7.3/en/os/SRPMS/wu-ftpd-2.6.2-11.73.1.src.rpm
3c53df7e43666c6b1dfc6b9bbbe4da06 7.3/en/os/i386/wu-ftpd-2.6.2-11.73.1.i386.rpm
dca07c4e90f308b49f8ac6b8d463536f 8.0/en/os/SRPMS/wu-ftpd-2.6.2-12.src.rpm
d7b8fc5c0f9c0938dbddcea76f8e1e22 8.0/en/os/i386/wu-ftpd-2.6.2-12.i386.rpm

These packages are GPG signed by Red Hat for security. Our key is available from

You can verify each package 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>

7. References:

8. Contact:

The Red Hat security contact is <>. More contact details at

Copyright 2003 Red Hat, Inc.