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Mandrake: wu-ftpd off-by-one vulnerability Print E-mail
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Posted by Team   
Mandrake There is an off-by- one bug in the fb_realpath() function which could be used by a remote attacker to obtain root privileges on the server.


                Mandrake Linux Security Update Advisory

Package name:           wu-ftpd
Advisory ID:            MDKSA-2003:080
Date:                   July 31st, 2003

Affected versions:	8.2

Problem Description:

 A vulnerability was discovered by Janusz Niewiadomski and Wojciech
 Purczynski in the wu-ftpd FTP server package.  They found an off-by-
 one bug in the fb_realpath() function which could be used by a
 remote attacker to obtain root privileges on the server.  This bug
 can only be successfully accomplished by using wu-ftpd binaries
 compiled on Linux 2.0.x and later 2.4.x kernels because the 2.2.x
 and earlier 2.4.x kernels define PATH_MAX to be 4095 characters.
 wu-ftpd is no longer shipped with Mandrake Linux, however Mandrake
 Linux 8.2 did come with wu-ftpd.  If you use wu-ftpd, you are
 encouraged to upgrade to these patched packages.


Updated Packages:
 Mandrake Linux 8.2:
 77260fab82a32fd204e29160c11f1e30  8.2/RPMS/wu-ftpd-2.6.2-1.1mdk.i586.rpm
 3fd974bd1e718accf048e489dbd52d55  8.2/SRPMS/wu-ftpd-2.6.2-1.1mdk.src.rpm

 Mandrake Linux 8.2/PPC:
 283cf3a7797ca19c8e83ae22c0415fd5  ppc/8.2/RPMS/wu-ftpd-2.6.2-1.1mdk.ppc.rpm
 3fd974bd1e718accf048e489dbd52d55  ppc/8.2/SRPMS/wu-ftpd-2.6.2-1.1mdk.src.rpm

Bug IDs fixed (see for more information):

To upgrade automatically, use MandrakeUpdate or urpmi.  The verification
of md5 checksums and GPG signatures is performed automatically for you.

A list of FTP mirrors can be obtained from:

All packages are signed by MandrakeSoft for security.  You can obtain
the GPG public key of the Mandrake Linux Security Team by executing:

  gpg --recv-keys --keyserver 0x22458A98

Please be aware that sometimes it takes the mirrors a few hours to

You can view other update advisories for Mandrake Linux at:

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to.  Information on these lists can be obtained by

If you want to report vulnerabilities, please contact

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team

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