__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
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__________________________________________________________
INFORMATION BULLETIN
SGI: Multiple Vulnerabilities in BSD LPR Subsystem
[SGI Security Advisory 20030406-02-P]
April 15, 2003 19:00 GMT Number N-076
[Revised 25 April 2003]
______________________________________________________________________________
PROBLEM: Several vulnerabilities in the IRIX bsdlpr printing subsystem
have been identified.
- lpd chkhost() routine is easily spoofed
- lpd should execl() sendmail -t, not sendmail
- Unstable behavior in lpd resulting from the patch4835 fixes
- lprm buffer overrun
PLATFORM: IRIX 6.5 through IRIX 6.5.19
DAMAGE: A local intruder could possibly gain unauthorized access to
the lpd server and may be able to gain additional privileges.
SOLUTION: Upgrade to IRIX 6.5.20 (when available). For IRIX 6.5.14
through 6.5.19, install patch 5048.
______________________________________________________________________________
VULNERABILITY The risk is LOW. A BSD LPR subsystem is not installed by
ASSESSMENT: default on IRIX 6.5 systems. A locally exploitable buffer
overflow in "lprm" may permit a local attacker to gain elevated
privileges and execute arbitrary code on a vulnerable host.
There are no known exploits at this time.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-076.shtml
ORIGINAL BULLETIN: ftp://patches.sgi.com/support/free/security/advisories/
20030406-02-P
______________________________________________________________________________
[***** Start SGI Security Advisory 20030406-02-P *****]
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SGI Security Advisory
Title : Multiple Vulnerabilities in BSD LPR Subsystem
Number : 20030406-02-P
Date : April 25, 2003
Reference: CERT VU#39001
Reference: CERT VU#30308
Reference: CERT VU#293305
Reference: CVE CAN-2003-0144
Reference: SGI Security Advisory 20030406-01-P
Reference: SGI BUGS 864917 865485 873984 874729 880124 883255
Fixed in : IRIX 6.5.20 or patch 5071
______________________________________________________________________________
- --------------
- --- Update ---
- --------------
This is an update to SGI Security Bulletin 20030406-01-P. The patch
referenced in that bulletin (patch 5048) did not contain the fixes for SGI
bug number 880124. SGI support has released a new patch (patch 5071) that
does contain all the fixes.
- -----------------------
- --- 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
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.
Security patches are available on both http://support.sgi.com/ and
ftp://patches.sgi.com/support/free/security/patches/
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 5071 Notes 2, 3, & 4
IRIX 6.5.15 yes 5071 Notes 2, 3, & 4
IRIX 6.5.16 yes 5071 Notes 2, 3, & 4
IRIX 6.5.17 yes 5071 Notes 2, 3, & 4
IRIX 6.5.18 yes 5071 Notes 2, 3, & 4
IRIX 6.5.19 yes 5071 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 and 5048.
##### Patch File Checksums ####
The actual patch will be a tar file containing the following files:
Filename: README.patch.5071
Algorithm #1 (sum -r): 21383 8 README.patch.5071
Algorithm #2 (sum): 57354 8 README.patch.5071
MD5 checksum: 9B471EF86C10DC32F837B1FDD044529A
Filename: patchSG0005071
Algorithm #1 (sum -r): 22998 3 patchSG0005071
Algorithm #2 (sum): 42262 3 patchSG0005071
MD5 checksum: 63AC61757D175E073D95B27E2D5D2A44
Filename: patchSG0005071.idb
Algorithm #1 (sum -r): 12029 3 patchSG0005071.idb
Algorithm #2 (sum): 52574 3 patchSG0005071.idb
MD5 checksum: 4001E601B65EFE361F5EE694023EFA5A
Filename: patchSG0005071.print_sw
Algorithm #1 (sum -r): 29965 266 patchSG0005071.print_sw
Algorithm #2 (sum): 10328 266 patchSG0005071.print_sw
MD5 checksum: F3740393AEAE2EB9C89CCBA326EC8373
- ------------------------
- --- 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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[***** End SGI Security Advisory 20030406-02-P *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of SGI for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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