AUSCERT External Security Bulletin Redistribution

                     ESB-2003.0377 -- RHSA-2003:171-01
            Updated CUPS packages fix denial of service attack
                                28 May 2003


        AusCERT Security Bulletin Summary

Product:                CUPS
Publisher:              Red Hat
Operating System:       Red Hat Linux 9
                        Red Hat Linux 8.0
                        Red Hat Linux 7.3
Impact:                 Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0195

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                   Red Hat Security Advisory

Synopsis:          Updated CUPS packages fix denial of service attack
Advisory ID:       RHSA-2003:171-01
Issue date:        2003-05-27
Updated on:        2003-05-27
Product:           Red Hat Linux
Cross references:  
Obsoletes:         RHSA-2002:295
CVE Names:         CAN-2003-0195
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1. Topic:

Updated CUPS packages that fix a denial of service vulnerability are now

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

CUPS is a print spooler.  CUPS is used as the default print spooler on new
installations of Red Hat Linux 9, and has been provided (though not as the
default) for Red Hat Linux 7.3 and Red Hat Linux 8.0.

Phil D'Amore of Red Hat discovered a vulnerability in the CUPS IPP
(Internet Printing Protocol) implementation.  The IPP implementation is
single-threaded, which means only one request can be serviced at a time. 
An attacker could make a partial request that does not time out and
therefore creates a denial of service. In order to exploit this bug, an
attacker must have the ability to make a TCP connection to the IPP port (by
default 631). 

All print servers using CUPS should upgrade to these erratum packages,
which contain a patch and are not vulnerable to 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 7.3:



Red Hat Linux 8.0:



Red Hat Linux 9:



6. Verification:

MD5 sum                          Package Name
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ccad6f342acd7cb20f4564c4ec7662b7 7.3/en/os/SRPMS/cups-1.1.14-15.4.src.rpm
f607a87ef72ed8e54c49241c865ee578 7.3/en/os/i386/cups-1.1.14-15.4.i386.rpm
6bb84bd1c0cfb95792aea1a87c5ca545 7.3/en/os/i386/cups-devel-1.1.14-15.4.i386.rpm
67006ca3cf4d703c41ed7ac9fbe7e70f 7.3/en/os/i386/cups-libs-1.1.14-15.4.i386.rpm
b1cc8d3a3874b901df0a9a7af62922a5 8.0/en/os/SRPMS/cups-1.1.17-0.7.src.rpm
73d565a0540219e931029c1fe14b831b 8.0/en/os/i386/cups-1.1.17-0.7.i386.rpm
f8cf990aa6f0b652a451be6be783bbe8 8.0/en/os/i386/cups-devel-1.1.17-0.7.i386.rpm
2249276c7a52692965918d2dbb9ee118 8.0/en/os/i386/cups-libs-1.1.17-0.7.i386.rpm
fd361f163c6dce35d50f94563b6f5774 9/en/os/SRPMS/cups-1.1.17-13.3.src.rpm
cbc15e9989207900f85476cfe920e477 9/en/os/i386/cups-1.1.17-13.3.i386.rpm
bdc49692f7f86bc4a19b7f3611b0e4b9 9/en/os/i386/cups-devel-1.1.17-13.3.i386.rpm
79f0146526b6e6495accec0bf2927ad1 9/en/os/i386/cups-libs-1.1.17-13.3.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available at http://www.redhat.com/solutions/security/news/publickey/

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 <security@redhat.com>.  More contact
details at http://www.redhat.com/solutions/security/news/contact/

Copyright 2003 Red Hat, Inc.

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