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[RHSA-2003:310-01] Updated fileutils packages fix ls vulnerabilities



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                   Red Hat Security Advisory

Synopsis:          Updated fileutils packages fix ls vulnerabilities
Advisory ID:       RHSA-2003:310-01
Issue date:        2003-11-12
Updated on:        2003-11-12
Product:           Red Hat Enterprise Linux
Keywords:          
Cross references:  
Obsoletes:         RHEA-2003:272
CVE Names:         CAN-2003-0853 CAN-2003-0854
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1. Topic:

Updated fileutils packages that close a potential denial of service
vulnerability are 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
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

The fileutils package contains several basic system utilities. One of
these utilities is the "ls" program, which is used to list information
about files and directories. 

Georgi Guninski discovered a memory starvation denial of service
vulnerability in the ls program.  It is possible to make ls allocate a
huge amount of memory by specifying certain command line arguments.  This
vulnerability is remotely exploitable through services like wu-ftpd, which
pass user arguments to ls.  The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2003-0854 to this issue.

A non-exploitable integer overflow in ls has been discovered.  It is
possible to make ls crash by specifying certain command line arguments. 
This vulnerability is remotely exploitable through services like wu-ftpd,
which pass user arguments to ls.  The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2003-0853 to this issue.

Users are advised to update to these erratum packages, which contain
backported security patches that correct these vulnerabilities.

These packages also add support for the O_DIRECT flag, which controls the
use of synchronous I/O on file systems such as OCFS.

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.

If up2date fails to connect to Red Hat Network due to SSL Certificate 
Errors, you need to install a version of the up2date client with an updated 
certificate.  The latest version of up2date is available from the Red Hat 
FTP site and may also be downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

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

107821 - CAN-2003-0853/0854 DoS in services that use "ls"
102006 - fileutils needs O_DIRECT support for OCFS

6. RPMs required:

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

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/fileutils-4.1-10.4.src.rpm

i386:
Available from Red Hat Network: fileutils-4.1-10.4.i386.rpm

ia64:
Available from Red Hat Network: fileutils-4.1-10.4.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/fileutils-4.1-10.4.src.rpm

ia64:
Available from Red Hat Network: fileutils-4.1-10.4.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/fileutils-4.1-10.4.src.rpm

i386:
Available from Red Hat Network: fileutils-4.1-10.4.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/fileutils-4.1-10.4.src.rpm

i386:
Available from Red Hat Network: fileutils-4.1-10.4.i386.rpm



7. Verification:

MD5 sum                          Package Name
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2cbf191530b8ea940e3b67242527079e 2.1AS/en/os/SRPMS/fileutils-4.1-10.4.src.rpm
69c66c5ea3fdd55c1993ab7cfcfd0cdf 2.1AS/en/os/i386/fileutils-4.1-10.4.i386.rpm
23cfc912efb5b04a53fa68842a84f14a 2.1AS/en/os/ia64/fileutils-4.1-10.4.ia64.rpm
2cbf191530b8ea940e3b67242527079e 2.1AW/en/os/SRPMS/fileutils-4.1-10.4.src.rpm
23cfc912efb5b04a53fa68842a84f14a 2.1AW/en/os/ia64/fileutils-4.1-10.4.ia64.rpm
2cbf191530b8ea940e3b67242527079e 2.1ES/en/os/SRPMS/fileutils-4.1-10.4.src.rpm
69c66c5ea3fdd55c1993ab7cfcfd0cdf 2.1ES/en/os/i386/fileutils-4.1-10.4.i386.rpm
2cbf191530b8ea940e3b67242527079e 2.1WS/en/os/SRPMS/fileutils-4.1-10.4.src.rpm
69c66c5ea3fdd55c1993ab7cfcfd0cdf 2.1WS/en/os/i386/fileutils-4.1-10.4.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0853
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0854

9. Contact:

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

Copyright 2003 Red Hat, Inc.
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