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Home » Hacking News » SGI 20030406-01-P: multiple vulnerabilities in BSD LPR

SGI 20030406-01-P: multiple vulnerabilities in BSD LPR

by Nikola Strahija on April 16th, 2003 Several vulnerabilities have been found in bsdlpr printing subsystem which, if exploited, could lead to buffer overrun.


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______________________________________________________________________________
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
[email protected]

------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
[email protected]

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 [email protected]
subscribe wiretap
end
^d

In the example above, 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
[email protected]

For reporting *NEW* SGI security issues, email can be sent to
[email protected] 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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