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Category:   OS (UNIX)  >   bsdlpr Vendors:   SGI (Silicon Graphics)
(SGI Issues Fix for 'bsdlpr' on IRIX) Re: OpenBSD 'lprm' Buffer Overflow May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1006576
SecurityTracker URL:  http://securitytracker.com/id/1006576
CVE Reference:   CVE-2003-0144   (Links to External Site)
Date:  Apr 14 2003
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): IRIX 6.5.19 and prior versions
Description:   A buffer overflow was reported in the lprm utility for OpenBSD, also affecting the bsdlpr package on SGI's IRIX operating system. A local user may be able to execute arbitrary code with elevated privileges.

According to the report, a bounds check fix added to the program back in 1996 was ineffective. A local user may be able to cause arbitrary code to be executed.

The code will run with the privileges of lprm. In OpenBSD 3.1 and prior versions, lprm is configured with set user id (setuid) root privileges. In OpenBSD 3.2, lprm is configured with setuid daemon privileges.

The report indicates that it is not known whether the flaw is exploitable in practice or not.

The vendor credtis Arne Woerner for reporting the flaw.

Impact:   A local user may be able to execute arbitrary code with elevated privileges.
Solution:   The vendor has released a fixed version of IRIX (6.5.20) that includes the fix for bsdlpr. The vendor has also released patches for 6.5.14 - 6.5.19 (patch 5048).

The Patch File Checksums are:

Filename: README.patch.5048
Algorithm #1 (sum -r): 51846 8 README.patch.5048
Algorithm #2 (sum): 47369 8 README.patch.5048
MD5 checksum: 3175319BBCAD0FB259BC2F7000660183

Filename: patchSG0005048
Algorithm #1 (sum -r): 49890 3 patchSG0005048
Algorithm #2 (sum): 36149 3 patchSG0005048
MD5 checksum: C9C44E3180CB19C1B9F7CD53085E5881

Filename: patchSG0005048.idb
Algorithm #1 (sum -r): 28007 3 patchSG0005048.idb
Algorithm #2 (sum): 52656 3 patchSG0005048.idb
MD5 checksum: 80EF1CE4AF3D0B31E078C11A7AB31AF5

Filename: patchSG0005048.print_sw
Algorithm #1 (sum -r): 60504 265 patchSG0005048.print_sw
Algorithm #2 (sum): 29117 265 patchSG0005048.print_sw
MD5 checksum: 4B6F65DCB5BEA2966D60EC03D3FA6F9C

Vendor URL:  www.sgi.com/support/security/ (Links to External Site)
Cause:   Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
Mar 5 2003 OpenBSD 'lprm' Buffer Overflow May Let Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  Multiple Vulnerabilities in BSD LPR Subsystem on IRIX


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

______________________________________________________________________________
                          SGI Security Advisory

Title    : Multiple Vulnerabilities in BSD LPR Subsystem
Number   : 20030406-01-P
Date     : April 14, 2003
Reference: CERT VU#39001
Reference: CERT VU#30308
Reference: CERT VU#293305
Reference: CVE CAN-2003-0144
Reference: SGI BUGS 864917 865485 873984 874729 880124 883255
Fixed in : IRIX 6.5.20 (when available) or patch 5048
______________________________________________________________________________

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

It's been reported that there are several vulnerabilities in the IRIX bsdlpr
printing subsystem:

  o  lpd chkhost() routine is easily spoofed
     See: http://www.kb.cert.org/vuls/id/30308

  o  lpd should execl() sendmail -t, not sendmail
     See: http://www.kb.cert.org/vuls/id/39001

  o  Unstable behavior in lpd resulting from the patch4835 fixes

  o  lprm buffer overrun
     See: http://www.insecure.org/sploits/lprm.overflow.html
          http://www.kb.cert.org/vuls/id/293305
          http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0144

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.

These issues have been corrected with patches and in future releases of IRIX.


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

The bsdlpr subsystem is not installed by default on IRIX 6.5 systems.
It is an optional product which can be installed as "print.sw.bsdlpr".

To determine the version of IRIX you are running, execute the following
command:

  # /bin/uname -R

That will return a result similar to the following:

  # 6.5 6.5.19f

The first number ("6.5") is the release name, the second ("6.5.16f" in this
case) is the extended release name.  The extended release name is the
"version" we refer to throughout this document.

To see if the bsdlpr subsystem is installed, execute the following command:

  $ versions print.sw.bsdlpr
  I = Installed, R = Removed

     Name                 Date        Description
     I  print                01/30/2003  Printing Tools, Release 1.16.5f
     I  print.sw             01/30/2003  Printing Tools Software 1.16.5f
     I  print.sw.bsdlpr      01/30/2003  Berkeley 'lpr' Printer Spooler

If the output shown is similar to the above, then the subsystem is installed
and the system may be vulnerable.


- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

There is no effective workaround available for these problems if the bsdlpr
capabilities are needed in your printing environment.  SGI recommends either
upgrading to IRIX 6.5.20 (when available), or installing the appropriate
patch from the listing below.


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

SGI has provided a series of patches for these vulnerabilities. Our
recommendation is to upgrade to IRIX 6.5.20 when available, or install
the appropriate patch.

   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      unknown                     Note 1
   IRIX 6.1        unknown                     Note 1
   IRIX 6.2        unknown                     Note 1
   IRIX 6.3        unknown                     Note 1
   IRIX 6.4        unknown                     Note 1
   IRIX 6.5          yes                       Notes 2 & 3
   IRIX 6.5.1        yes                       Notes 2 & 3
   IRIX 6.5.2        yes                       Notes 2 & 3
   IRIX 6.5.3        yes                       Notes 2 & 3
   IRIX 6.5.4        yes                       Notes 2 & 3
   IRIX 6.5.5        yes                       Notes 2 & 3
   IRIX 6.5.6        yes                       Notes 2 & 3
   IRIX 6.5.7        yes                       Notes 2 & 3
   IRIX 6.5.8        yes                       Notes 2 & 3
   IRIX 6.5.9        yes                       Notes 2 & 3
   IRIX 6.5.10       yes                       Notes 2 & 3
   IRIX 6.5.11       yes                       Notes 2 & 3
   IRIX 6.5.12       yes                       Notes 2 & 3
   IRIX 6.5.13       yes                       Notes 2 & 3
   IRIX 6.5.14       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.15       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.16       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.17       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.18       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.19       yes            5048       Notes 2, 3, & 4
   IRIX 6.5.20        no

   NOTES

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

     2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
        SGI Support Provider or URL: http://support.sgi.com/

     3) Upgrade to IRIX 6.5.20 (when available)

     4) Install the patch or upgrade to IRIX 6.5.20 (when available).
        Security patches are available on both http://support.sgi.com/ and
        ftp://patches.sgi.com/support/free/security/patches/
        Note that the patch does include all the fixes that were originally
        in patch 4835.

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

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

Filename:                 README.patch.5048
Algorithm #1 (sum -r):    51846 8 README.patch.5048
Algorithm #2 (sum):       47369 8 README.patch.5048
MD5 checksum:             3175319BBCAD0FB259BC2F7000660183

Filename:                 patchSG0005048
Algorithm #1 (sum -r):    49890 3 patchSG0005048
Algorithm #2 (sum):       36149 3 patchSG0005048
MD5 checksum:             C9C44E3180CB19C1B9F7CD53085E5881

Filename:                 patchSG0005048.idb
Algorithm #1 (sum -r):    28007 3 patchSG0005048.idb
Algorithm #2 (sum):       52656 3 patchSG0005048.idb
MD5 checksum:             80EF1CE4AF3D0B31E078C11A7AB31AF5

Filename:                 patchSG0005048.print_sw
Algorithm #1 (sum -r):    60504 265 patchSG0005048.print_sw
Algorithm #2 (sum):       29117 265 patchSG0005048.print_sw
MD5 checksum:             4B6F65DCB5BEA2966D60EC03D3FA6F9C


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

SGI wishes to thank the U.S. Air Force, NASA and the users of the Internet
Community at large for their assistance in this matter.


- -------------
- --- Links ---
- -------------

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/ 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/

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

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

IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/

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

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.


- -----------------------------------------
- --- 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
security-info@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 such as aaanalyst@sgi.com>
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------

If there are general security questions on SGI systems, email can be sent to
security-info@sgi.com.

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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