__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Center
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________
INFORMATION BULLETIN
SGI netprint Dynamic Shared Objects (DSO) Exploit
[SGI Security Advisory 20010701-01-P]
July 27, 2001 19:00 GMT Number L-125
______________________________________________________________________________
PROBLEM: The 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.
PLATFORM: SGI IRIX 6.5 systems.
DAMAGE: An unauthorized local user can use root privileges to run
arbitrary code.
SOLUTION: Apply the patches or workarounds as prescribed by the SGI
Security Advisory.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. A local user account is required in order
ASSESSMENT: to exploit this vulnerability.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/l-125.shtml
______________________________________________________________________________
[***** Start SGI Security Advisory 20010701-01-P *****]
______________________________________________________________________________
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.
[***** End SGI Security Advisory 20010701-01-P *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of SGI for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7x24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
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