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Category:   Application (Generic)  >   Netprint Vendors:   SGI (Silicon Graphics)
(SGI Issues Fix) Re: SGI's Netprint Utility for IRIX Allows Local Users to Obtain Root Level Access
SecurityTracker Alert ID:  1002084
SecurityTracker URL:  http://securitytracker.com/id/1002084
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 25 2001
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.4; possibly higher versions
Description:   SGI's netprint utility for IRIX contains a vulnerability that allows a local user to obtain root level privileges.

Netprint reportedly contains a vulnerability in its processing of dynamic shared object (DSO) files that are specified by the local user with the "-n" command line switch. This switch allows the user to specify the name of the DSO to be used to communicate with the remote system (using the BSD LPR protocols). A user can apparently create a fake shared object file containing arbitrary code and can cause netprint to execute that code. Because netprint is reportedly configured with set user id (setuid) privileges, this allows the local user to gain root level access.

Some demonstration exploit source code is available at the following URL:

http://realhalo.org/xnetprint.c

Impact:   A local user can obtain root level privileges on the server.
Solution:   SGI has issued a fix. See the Source Message for details on obtaining the appropriate patch.
Vendor URL:  www.sgi.com/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  UNIX (SGI/IRIX)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 26 2001 SGI's Netprint Utility for IRIX Allows Local Users to Obtain Root Level Access



 Source Message Contents

Subject:  netprint DSO exploit


-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________
                          SGI Security Advisory

        Title:      netprint DSO exploit
        Reference:  CVE CAN-2001-0485
        Number:     20010701-01-P
        Date:       July 25, 2001
______________________________________________________________________________

SGI provides this information freely to the SGI user community for its
consideration, interpretation, implementation and use.   SGI recommends
that this information be acted upon as soon as possible.

SGI provides the information in this Security Advisory on an "AS-IS" basis
only, and disclaims all warranties with respect thereto, express, implied
or otherwise, including, without limitation, any warranty of merchantability
or fitness for a particular purpose.  In no event shall SGI be liable for
any loss of profits, loss of business, loss of data or for any indirect,
special, exemplary, incidental or consequential damages of any kind arising
from your use of, failure to use or improper use of any of the instructions
or information in this Security Advisory.
______________________________________________________________________________

- -------------------
- --- Update Info ---
- -------------------

A modification to netprint exploit reported on SGI Security Advisories
19961203-01-PX and 19961203-02-PX allows root access on IRIX 6.5 systems
that have open lp accounts.


- -----------------------
- --- Issue Specifics ---
- -----------------------

v9@realhalo.org has reported to BUGTRAQ a vulnerability in netprint
which can lead to a root compromise on IRIX 6.5 systems that have open
lp accounts.

SGI has investigated the issue and recommends the following steps for
neutralizing the exposure.  It is HIGHLY RECOMMENDED that these measures
be implemented on ALL vulnerable SGI systems.  This issue will be
corrected in future releases of IRIX.


- --------------
- --- Impact ---
- --------------

The /usr/lib/print/netprint program is installed on all SGI IRIX systems
by default.

A potential security vulnerability has been found that can result in
root privileges being obtained for systems with open lp accounts.

A local user account is required in order to exploit this vulnerability.

This netprint vulnerability has been publicly discussed in Usenet newsgroups
and mailing lists.

This netprint DSO vulnerability was reported by v9@realhalo.org :
http://www.securityfocus.com/bid/395
http://www.securityfocus.com/archive/1/179791

This vulnerability has been assigned the following CVE: CAN-2001-0485
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0485


- --------------------------
- --- Temporary Solution ---
- --------------------------

Although patches are available for this issue, it is realized that
there may be situations where installing the patches immediately may
not be possible.

The steps below can be used to disable the netprint program to prevent
exploitation of this vulnerability until patches can be installed.


      =================
      **** WARNING ****
      =================

      Removing the setuid root permissions from the netprint
      program will prevent non-root users from using netprint.


     1) Become the root user on the system.

                % /bin/su -
                Password:
                #

     2) Change the permissions on the netprint program.

                # /bin/chmod 500 /usr/lib/print/netprint


     3) Return to previous level.

                # exit
                %


- ----------------
- --- Solution ---
- ----------------

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------

   IRIX 3.x          unknown                       Note 1
   IRIX 4.x          unknown                       Note 1
   IRIX 5.x          unknown                       Note 1
   IRIX 6.0.x-6.4    unknown                       Note 1
   IRIX 6.5-6.5.11   yes                           Note 2 & 3
   IRIX 6.5.12m      yes           4310            Note 3 & 4
   IRIX 6.5.12f      yes           4311            Note 3 & 4
   IRIX 6.5.13       no                            Note 4


   NOTES

     1) This version of the IRIX operating has been retired.
        Upgrade to an actively supported IRIX operating system.
        See  http://support.sgi.com/news/support/index.html#customer_letters
        for more information.

     2) This version of the IRIX operating system is in maintenance mode.
        Upgrade to an actively supported IRIX operating system.
        See http://support.sgi.com/news/support/index.html#customer_letters
        for more information.

     3) See "Temporary Solution" section.

     4) Download the latest IRIX 6.5 Maintenance Release from the URL:
        http://support.sgi.com/colls/patches/tools/relstream/index.html
        or contact your local SGI support provider to obtain the
        latest IRIX 6.5 Maintenance Release CD set.


Patches are available via the web, anonymous FTP and from your SGI
service/support provider.

SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/advisories/

SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/patches/

SGI patches for IRIX can be found at the following patch servers:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/

SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/

SGI fixes for SGI open sourced code can be found on:
http://oss.sgi.com/projects/

SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or
http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/

SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/nt/

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/colls/patches/tools/relstream/index.html

IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/irix/swupdates/

The primary SGI anonymous FTP site for security advisories and patches
is patches.sgi.com (216.32.174.211).  Security advisories and patches
are located under the URL ftp://patches.sgi.com/support/free/security/

For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not
do a real-time update.


                 ##### Patch File Checksums ####

The actual patch will be a tar file containing the following files:

Filename:                 README.patch.4310
Algorithm #1 (sum -r):    15520 8 README.patch.4310
Algorithm #2 (sum):       29352 8 README.patch.4310
MD5 checksum:             CA53410D76FD4BE978A04DF4C1FC9DCA

Filename:                 patchSG0004310
Algorithm #1 (sum -r):    42076 2 patchSG0004310
Algorithm #2 (sum):       36286 2 patchSG0004310
MD5 checksum:             ED4F415E8D3341560680E3B5BAC5AEEF

Filename:                 patchSG0004310.idb
Algorithm #1 (sum -r):    50455 1 patchSG0004310.idb
Algorithm #2 (sum):       37083 1 patchSG0004310.idb
MD5 checksum:             B41D14724D6E125C4D2963C3AB06D758

Filename:                 patchSG0004310.print_sw
Algorithm #1 (sum -r):    29531 24 patchSG0004310.print_sw
Algorithm #2 (sum):       9251 24 patchSG0004310.print_sw
MD5 checksum:             47BDF1195787C13C11654D30708BB2A0


Filename:                 README.patch.4311
Algorithm #1 (sum -r):    65116 8 README.patch.4311
Algorithm #2 (sum):       29192 8 README.patch.4311
MD5 checksum:             8E4D6CD82A996CC94E24F3ED458EA6FD

Filename:                 patchSG0004311
Algorithm #1 (sum -r):    29883 2 patchSG0004311
Algorithm #2 (sum):       37557 2 patchSG0004311
MD5 checksum:             A0FB9860D3C41ADB1D3979A64E358DFB

Filename:                 patchSG0004311.idb
Algorithm #1 (sum -r):    62316 1 patchSG0004311.idb
Algorithm #2 (sum):       37115 1 patchSG0004311.idb
MD5 checksum:             DC6FDD6DD7B5A0F0404AC8CB5EB91783

Filename:                 patchSG0004311.print_sw
Algorithm #1 (sum -r):    41881 24 patchSG0004311.print_sw
Algorithm #2 (sum):       7152 24 patchSG0004311.print_sw
MD5 checksum:             BC2A92B11A049ADC04984E6967973A9A


- ------------------------
- --- Acknowledgments ----
- ------------------------

SGI wishes to thank the users of the Internet Community at large for
their assistance in this matter.


- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------

If there are questions about this document, email can be sent to
security-info@sgi.com.

                      ------oOo------

SGI provides security information and patches for use by the entire SGI
community.  This information is freely available to any person needing
the information and is available via anonymous FTP and the Web.

The primary SGI anonymous FTP site for security advisories and patches
is patches.sgi.com (216.32.174.211).  Security advisories and patches
are located under the URL ftp://patches.sgi.com/support/free/security/

The SGI Security Headquarters Web page is accessible at the URL:
http://www.sgi.com/support/security/

For issues with the patches on the FTP sites, email can be sent to
cse-security-alert@sgi.com.

For assistance obtaining or working with security patches, please
contact your SGI support provider.

                      ------oOo------

SGI provides a free security mailing list service called wiretap and
encourages interested parties to self-subscribe to receive (via email) all
SGI Security Advisories when they are released. Subscribing to the mailing
list can be done via the Web (http://www.sgi.com/support/security/wiretap.html)
or by sending email to SGI as outlined below.

% mail wiretap-request@sgi.com
subscribe wiretap <YourEmailAddress>
end
^d

In the example above, <YourEmailAddress> is the email address that you
wish the mailing list information sent to.  The word end must be on a
separate line to indicate the end of the body of the message. The
control-d (^d) is used to indicate to the mail program that you are
finished composing the mail message.


                      ------oOo------

SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .

                      ------oOo------

For reporting *NEW* SGI security issues, email can be sent to
security-alert@sgi.com or contact your SGI support provider.  A
support contract is not required for submitting a security report.

______________________________________________________________________________
      This information is provided freely to all interested parties
      and may be redistributed provided that it is not altered in any
      way, SGI is appropriately credited and the document retains and
      includes its valid PGP signature.


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