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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1520
Multiple Security Vulnerabilities in the Common Unix Printing System (CUPS)
            Web Interface in OpenSolaris May Lead to Cross-Site
            Scripting (XSS) and HTTP Response Splitting Attacks
                             12 November 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Common Unix Printing System (CUPS)
Publisher:         Sun Microsystems
Operating System:  OpenSolaris
Impact/Access:     Cross-site Scripting -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2009-2820  

Reference:         ESB-2009.1502

Original Bulletin: 
   http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-271169-1

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Multiple Security Vulnerabilities in the Common Unix Printing System
(CUPS) Web Interface in OpenSolaris May Lead to Cross-Site Scripting
(XSS) and HTTP Response Splitting Attacks
  _________________________________________________________________

Category :                   Security
Release Phase :              Workaround
Bug Id :                     6893187
Product :                    OpenSolaris
Date of Workaround Release : 10-Nov-2009

Multiple Security Vulnerabilities in the Common Unix Printing System 
(CUPS) Web Interface in OpenSolaris May Lead to Cross-Site Scripting (XSS) 
and HTTP Response Splitting Attacks


1. Impact

The web interface of the Common Unix Printing System (CUPS) in
versions 1.4.1 and earlier is impacted by multiple security
vulnerabilities which may lead to Cross-Site Scripting (XSS) and HTTP
Response Splitting Attacks. These vulnerabilities could allow an
unprivileged local or remote user (depending on the CUPS configuration), 
to inject malicious client-side scripts or HTML into the CUPS web interface 
page.
These issues are also described in the following document:

CVE-2009-2820 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2820

2. Contributing Factors

These issues can occur in the following releases:
SPARC Platform
  * OpenSolaris based upon builds snv_87 or later

x86 Platform
  * OpenSolaris based upon builds snv_87 or later

Notes:

1. Solaris 8, 9, and 10 are not impacted by these issues.

2. OpenSolaris distributions may include additional bug fixes above
   and beyond the build from which it was derived. The base build
   can be derived as follows:
   $ uname -v
   snv_101

3. These vulnerabilities only affect OpenSolaris systems which have
   installed the CUPS package (SUNWcups). The SUNWcups package is not
   installed by default. To determine if the SUNWcups package is
   installed, the following command can be run:
   $ pkg info SUNWcups

4. These vulnerabilities only affect OpenSolaris systems which have
   configured and enabled CUPS for printing. To determine if the CUPS has
   been enabled, the following command can be run:
   $ svcs cups/in-lpd
   STATE          STIME    FMRI
   enabled        20:03:32 svc:/application/cups/in-lpd:default

5. These vulnerabilities only affect CUPS versions 1.4.1 and earlier.
   To determine the version of CUPS on the system the following command
   can be run:
   $ cups-config --version
   1.4.1

3. Symptoms

There are no predictable symptoms that would indicate the described
vulnerabilities have been exploited.

4. Workaround

To prevent these issues from occurring, the CUPS services may be
configured to disable access to the CUPS web interface by doing the
following:

1. Comment out the following line from '/etc/cups/cupsd.conf':
   Listen localhost:631
   (or)
   Port 631

2. Restart the cups/scheduler services:
   # svcadm restart cups/in-lpd
   # svcadm restart cups/scheduler

   Binary relief is available via the normal support channels.
   Note: The fix for this issue will not result in a change of CUPS
   version to 1.4.2.

5. Resolution

A final resolution is pending completion.

For more information on Security Sun Alerts, see Technical
Instruction ID 213557.

This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.

Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved

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