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UNIRAS Brief - 112/04 - Red Hat Security Bulletin - Updated wu-ftpd package fixes security issues



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 112/04 dated 10.03.04  Time: 11:50  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
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Red Hat Security Bulletin:

Updated wu-ftpd package fixes security issues.


Detail
====== 

Glenn Stewart discovered a flaw in wu-ftpd.  When configured with "restricted-gid 
home",  an authorized user could use this flaw to circumvent the configured home 
directory restriction by using chmod.  The Common Vulnerabilities and Exposures 
project (cve.mitre.org) has assigned the name CAN-2004-0148 to this issue.

Michael Hendrickx found a flaw in the S/Key login handling.  On servers using S/Key 
authentication, a remote attacker could overflow a buffer and potentially execute 
arbitrary code. 

Users of wu-ftpd are advised to upgrade to this updated package, which contains 
backported security patches and is not vulnerable to these issues.



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                   Red Hat Security Advisory

Synopsis:          Updated wu-ftpd package fixes security issues
Advisory ID:       RHSA-2004:096-01
Issue date:        2004-03-08
Updated on:        2004-03-08
Product:           Red Hat Enterprise Linux
Keywords:          ftpd
Cross references:  
Obsoletes:         RHSA-2003:246
CVE Names:         CAN-2004-0148
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1. Topic:

An updated wu-ftpd package that fixes two security issues is now available.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64 
Red Hat Linux Advanced Workstation 2.1 - ia64 Red Hat Enterprise Linux 
ES version 2.1 - 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 machines.

Glenn Stewart discovered a flaw in wu-ftpd.  When configured with 
"restricted-gid home",  an authorized user could use this flaw to 
circumvent the configured home directory restriction by using chmod.  
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2004-0148 to this issue.

Michael Hendrickx found a flaw in the S/Key login handling.  On servers 
using S/Key authentication, a remote attacker could overflow a buffer 
and potentially execute arbitrary code. 

Users of wu-ftpd are advised to upgrade to this updated package, which 
contains backported security patches and is not vulnerable to these issues.

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:

up2date

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

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

115979 - xferlog doesn't honor TZ environment variable
116825 - CAN-2004-0148 wu-ftpd user able to break out of restriction

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS: ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm

i386:
Available from Red Hat Network: wu-ftpd-2.6.1-22.i386.rpm

ia64:
Available from Red Hat Network: wu-ftpd-2.6.1-22.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS: ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm

ia64:
Available from Red Hat Network: wu-ftpd-2.6.1-22.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS: ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm

i386:
Available from Red Hat Network: wu-ftpd-2.6.1-22.i386.rpm



7. Verification:

MD5 sum                          Package Name
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114f1889ef402bf55447b091f25b2f62 2.1AS/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm
1b4f737c278d0597fc8597bc80a6137d 2.1AS/en/os/i386/wu-ftpd-2.6.1-22.i386.rpm
968a98b0db2fe15f01a6e1804755f78e 2.1AS/en/os/ia64/wu-ftpd-2.6.1-22.ia64.rpm
114f1889ef402bf55447b091f25b2f62 2.1AW/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm
968a98b0db2fe15f01a6e1804755f78e 2.1AW/en/os/ia64/wu-ftpd-2.6.1-22.ia64.rpm
114f1889ef402bf55447b091f25b2f62 2.1ES/en/os/SRPMS/wu-ftpd-2.6.1-22.src.rpm
1b4f737c278d0597fc8597bc80a6137d 2.1ES/en/os/i386/wu-ftpd-2.6.1-22.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is available from https://www.redhat.com/security/keys.html

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>


8. References:

http://www.securiteam.com/unixfocus/6X00Q1P8KC.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0148

9. Contact:

The Red Hat security contact is <secalert@xxxxxxxxxx>.  More contact details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.

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<End of UNIRAS Briefing>

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