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

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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

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:


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.

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