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[CIAC] INFORMATION BULLETIN
M-022: SGI IRIX shells create temporary files insecurely
[SGI Security Advisory 20011103-01-I]
November 28, 2001 22:00 GMT
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PROBLEM: Shells create /tmp files with predictable names for
input redirection with << operator.
PLATFORM: IRIX 3.x, 4.x, 5.x, 6.0x, 6.1, 6.2, 6.3, 6.4, 6.5,
6.5.1, 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.5.6, 6.5.7,
6.5.8, 6.5.9, 6.5.10 6.5.11, 6.5.12, 6.5.13.
* NOTE: Other versions of UNIX may be vulnerable as
well.
DAMAGE: Exploitation of these temporary files can lead to a
root compromise.
SOLUTION: Apply patches, or upgrade as outlined below.
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VULNERABILITY The risk is MEDIUM. A local user account on the system
ASSESSMENT: is required; these vulnerabilities have been discussed
on the Internet.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-022.shtml
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[***** Start SGI Security Advisory 20011103-01-I *****]
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SGI Security Advisory
Title: Various shells create temporary files insecurely
Number: 20011103-01-I
Reference: CERTŪ Advisory
Reference: CVE CAN-2000-1134
Date: November 26, 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.
______________________________________________________________________________
- -----------------------
- --- 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.
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 security mailing lists.
- ----------------
- --- Solution ---
- ----------------
The problems have been fixed in IRIX 6.5.14m and 6.5.14f.
IRIX 6.5.14m can be obtained for free from:
http://support.sgi.com/colls/patches/tools/relstream/index.html
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 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/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/
- -------------------
- --- Information ---
- -------------------
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.
- ------------------------
- --- Acknowledgments ----
- ------------------------
SGI wishes to thank Gordon Irlam, CVE, the CERT Coordination
Center and 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
security-info@sgi.com.
For assistance obtaining or working with security patches, please
contact your SGI support provider.
------oOo------
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------oOo------
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located at http://www.sgi.com/support/security/ .
------oOo------
If there are general security questions on SGI systems, email can be
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______________________________________________________________________________
This information is provided freely to all interested parties
and may be redistributed provided that it is not altered in any
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includes its valid PGP signature.
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[***** End SGI Security Advisory 20011103-01-I *****]
------------------------------------------------------------------------
CIAC wishes to acknowledge the contributions of SGI Systems for the
information contained in this bulletin.
------------------------------------------------------------------------
CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC can
be contacted at:
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------------------------------------------------------------------------
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UCRL-MI-119788
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