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AUSCERT External Security Bulletin Redistribution
ESB-2002.053 -- SGI Security Advisory
Various shells create temporary files insecurely
30 January 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: tcsh, bsh, and ksh
Vendor: SGI
Operating System: IRIX
Impact: Root Compromise
Access Required: Existing Account
Ref: ESB-2001.500
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______________________________________________________________________________
SGI Security Advisory
Title: Various shells create temporary files insecurely
Number: 20011103-02-P
Date: January 28, 2002
Reference: SGI Security Advisory 20011103-01-I
Reference: CERT/CC® Vulnerability Note VU#10277
Reference: CVE CAN-2000-1134
______________________________________________________________________________
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 ---
- - --------------
As part of on going security efforts, SGI has released patch 4469 and 4470
for this security issue.
The original text from SGI Security Advisory 20011103-01-I has been
updated to reflect this change.
- - -----------------------
- - --- Issue Specifics ---
- - -----------------------
Gordon Irlam of the University of Adelaide, Australia reported that sh uses
/tmp files of a predictable name in creating files for input redirection
using the << operator.
Further investigation shows that tcsh, csh, sh, and bash on various Unix
systems also exhibit the same behavior.
See http://www.kb.cert.org/vuls/id/10277 for additional details.
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 has been corrected in
future releases of IRIX.
- - --------------
- - --- Impact ---
- - --------------
The tcsh, bsh, and ksh shells are installed by default on IRIX.
A local user account on the vulnerable system is required in order to
exploit these shells.
The exploitation of these temporary files can lead to a root compromise.
This could be the case in the context of shell scripts run as root.
Original SGI Security Advisory:
ftp://patches.sgi.com/support/free/security/advisories/20011103-01-I
CERT reported this shell vulnerability:
http://www.kb.cert.org/vuls/id/10277
CVE reported a derivative:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2000-1134
These shell vulnerabilities have been publicly discussed in Usenet
newsgroups and mailing lists.
- - ----------------
- - --- Solution ---
- - ----------------
SGI has provided patches for these vulnerabilities for IRIX 6.5.10m/f
through 6.5.13m/f. The problems have been fixed in IRIX 6.5.14m and
6.5.14f. Our recommendation is to install the appropriate patch for your
operating system or upgrade to IRIX 6.5.14.
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 6.5.10m yes 4469 Note 3
IRIX 6.5.10f yes 4470 Note 3
IRIX 6.5.11m yes 4469 Note 3
IRIX 6.5.11f yes 4470 Note 3
IRIX 6.5.12m yes 4469 Note 3
IRIX 6.5.12f yes 4470 Note 3
IRIX 6.5.13m yes 4469 Note 3
IRIX 6.5.13f yes 4470 Note 3
IRIX 6.5.14m no Note 3
IRIX 6.5.14f no Note 3
NOTES
1) This version of the IRIX operating has been retired.
Upgrade to an actively supported IRIX operating system.
See http://support.sgi.com/irix/news/index.html#policy
for more information.
2) Download the IRIX 6.5.14 Maintenance Release Stream from the URL:
http://support.sgi.com/colls/patches/tools/relstream/index.html
3) 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/irix/swupdates/
##### Patch File Checksums ####
The actual patch will be a tar file containing the following files:
Filename: README.patch.4469
Algorithm #1 (sum -r): 01629 8 README.patch.4469
Algorithm #2 (sum): 32479 8 README.patch.4469
MD5 checksum: 6E13306A54EA586BED13A20BD2E03C85
Filename: patchSG0004469
Algorithm #1 (sum -r): 42382 2 patchSG0004469
Algorithm #2 (sum): 46610 2 patchSG0004469
MD5 checksum: 2F46BA267D4662AD21E6706E4A19A419
Filename: patchSG0004469.eoe_sw
Algorithm #1 (sum -r): 57846 1765 patchSG0004469.eoe_sw
Algorithm #2 (sum): 55752 1765 patchSG0004469.eoe_sw
MD5 checksum: 084BEDDC3A5E8CD7C850A624C699770E
Filename: patchSG0004469.idb
Algorithm #1 (sum -r): 22610 2 patchSG0004469.idb
Algorithm #2 (sum): 52668 2 patchSG0004469.idb
MD5 checksum: 877335189390C6204F72628B73CA871C
Filename: README.patch.4470
Algorithm #1 (sum -r): 53349 8 README.patch.4470
Algorithm #2 (sum): 32340 8 README.patch.4470
MD5 checksum: 56D7C0A042C928C4E213DA344086F2A7
Filename: patchSG0004470
Algorithm #1 (sum -r): 53607 2 patchSG0004470
Algorithm #2 (sum): 48117 2 patchSG0004470
MD5 checksum: 6507BE3943D55B89CC9BA499DD81858C
Filename: patchSG0004470.eoe_sw
Algorithm #1 (sum -r): 61098 1879 patchSG0004470.eoe_sw
Algorithm #2 (sum): 2436 1879 patchSG0004470.eoe_sw
MD5 checksum: D3AE68A434CB55E7D51EF09150279C15
Filename: patchSG0004470.idb
Algorithm #1 (sum -r): 04347 2 patchSG0004470.idb
Algorithm #2 (sum): 52706 2 patchSG0004470.idb
MD5 checksum: 867D317439B3E150E93FA6A044EFC3EC
- - ------------------------
- - --- Acknowledgments ----
- - ------------------------
SGI wishes to thank Gordon Irlam, CVE, the CERT Coordination Center, Walter
Roberson of National Research Council Canada and the users of the Internet
Community at large for their assistance in this matter.
- - ------------------
- - --- References ---
- - ------------------
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.
- - -----------------------------------------
- - --- 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
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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------
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
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