IRIX telnetd vulnerability
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CIAC INFORMATION BULLETIN
K-066a: IRIX telnetd vulnerability
September 13, 2000 01:00 GMT
[Revision A 9/13/2000 Revised with SGI patch information]
PROBLEM: A vulnerability exists in the telnet daemon which can give an
attacker remote root access.
PLATFORM: Irix 6.2 - 6.5.8 and patched versions of the telnet daemon in
Irix 5.2 - 6.1.
DAMAGE: A remote attacker could gain root privileges.
SOLUTION: SGI has released patches for most of the affected platforms.
Apply the patches or fixes as directed below.
VULNERABILITY The risk is HIGH. The exploit code has been published in public
ASSESSMENT: forums.
[****** Start SGI Security Advisory ******]
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SGI Security Advisory
Title: IRIX telnetd vulnerability
Number: 20000801-02-P
Date: September 12, 2000
______________________________________________________________________________
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 ---
- -------------------
Due to a patch packaging error, patch 4044 required an unnecessary reboot
after installation of the patch. Patch 4060 has been released which has
the same telnetd binary fix, but the patch has been marked not to require
a reboot after installation.
If you have installed patch 4044 and rebooted, there is no need to install
patch 4060.
The SGI patch server sites are being updated to provide only the corrected
packaged patch 4060.
The checksums below have been updated to reflect the current
packaged patch 4060 values.
- -----------------------
- --- Issue Specifics ---
- -----------------------
The Last Stage of Delirium Group (http://lsd-pl.net/) has reported
via BUGTRAQ that an exploitable buffer overflow has been discovered in
telnetd daemon which can lead to a root compromise.
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 telnetd daemon is installed by default on IRIX.
A local user account on the vulnerable system is not required in order
to exploit telnetd daemon. The telnetd daemon can be exploited remotely
over an untrusted network.
The exploitable buffer overflow vulnerability can lead to a root compromise.
This telnetd buffer overflow vulnerability was reported by LSD on BUGTRAQ:
http://msgs.securepoint.com/cgi-bin/get/bugtraq0008/152.html
http://lsd-pl.net/files/get?IRIX/irx_telnetd
This telnetd vulnerability has been publicly discussed in Usenet newsgroups
and mailing lists.
- --------------------------
- --- 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 telnetd daemon to prevent
exploitation of this vulnerability until patches can be installed.
================
**** NOTE ****
================
Disabling telnetd daemon will disable the telnet service.
1) Become the root user on the system.
% /bin/su -
Password:
#
2) Edit the file /etc/inetd.conf (for IRIX 5.3 and lower,
edit /usr/etc/inetd.conf) with your favorite text editor.
Place a "#" as the first character of the line to comment out
and deactivate the telnetd daemon.
# vi /etc/inetd.conf
{Find the following line}
telnet stream tcp nowait root /usr/etc/telnetd telnetd
{Place a "#" as the first character of the telnet line}
#telnet stream tcp nowait root /usr/etc/telnetd telnetd
{Save the file}
3) Force inetd to re-read the configuration file.
# /etc/killall -HUP inetd
4) Kill any existing telnetd process.
# /etc/killall telnetd
5) 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 5.0.x unknown Note 1
IRIX 5.1.x unknown Note 1
IRIX 5.2 yes not avail Note 1 & 3
IRIX 5.3 yes in progress Note 1 & 3
IRIX 6.0.x yes not avail Note 1 & 3
IRIX 6.1 yes not avail Note 1 & 3
IRIX 6.2 yes 4050 Note 2 & 3
IRIX 6.3 yes in progress Note 1 & 3
IRIX 6.4 yes in progress Note 1 & 3
IRIX 6.5 yes 4060 Note 3 & 4
IRIX 6.5.1 yes 4060 Note 3 & 4
IRIX 6.5.2 yes 4060 Note 3 & 4
IRIX 6.5.3 yes 4060 Note 3 & 4
IRIX 6.5.4 yes 4060 Note 3 & 4
IRIX 6.5.5 yes 4060 Note 3 & 4
IRIX 6.5.6 yes 4060 Note 3 & 4
IRIX 6.5.7 yes 4060 Note 3 & 4
IRIX 6.5.8 yes 4060 Note 3 & 4
IRIX 6.5.9 yes 4060 Note 3 & 4
IRIX 6.5.10 no Note 5
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) This version of the IRIX operating system is in maintenance mode.
Upgrade to an actively supported IRIX operating system.
See http://support.sgi.com/irix/news/index.html#policy
for more information.
3) See "Temporary Solution" section.
4) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
SGI Support Provider or download the IRIX 6.5.X Maintenance Release
Stream from http://support.sgi.com/ or
ftp://patches.sgi.com/support/relstream/
5) IRIX 6.5.10 is scheduled to be released in the October time-frame.
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://sgigate.sgi.com/security/
SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and ftp://sgigate.sgi.com/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/ and click on patches link 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/irix/ and ftp://patches.sgi.com/support/relstream/
The primary SGI anonymous FTP site for security information and patches
is sgigate.sgi.com (204.94.209.1). Security information and patches can be
found in the ~ftp/security and ~ftp/patches directories, respectively.
For security and patch management reasons, ftp.sgi.com (mirror of sgigate) lags
behind and does not do a real-time update of ~ftp/security and ~ftp/patches
##### Patch File Checksums ####
The actual patch will be a tar file containing the following files:
Filename: patchSG0004050
Algorithm #1 (sum -r): 29875 17 patchSG0004050
Algorithm #2 (sum): 63516 17 patchSG0004050
MD5 checksum: C40B2DE50608C0A6C79C2167116FF76E
Filename: patchSG0004050.eoe_man
Algorithm #1 (sum -r): 60740 74 patchSG0004050.eoe_man
Algorithm #2 (sum): 15611 74 patchSG0004050.eoe_man
MD5 checksum: C45B59724AC5F81F5960BE78104A6B9E
Filename: patchSG0004050.eoe_sw
Algorithm #1 (sum -r): 47453 1976 patchSG0004050.eoe_sw
Algorithm #2 (sum): 46187 1976 patchSG0004050.eoe_sw
MD5 checksum: 1D9727E9EAC3F52D56F2EC7F481D5C73
Filename: patchSG0004050.eoe_sw64
Algorithm #1 (sum -r): 49580 104 patchSG0004050.eoe_sw64
Algorithm #2 (sum): 38983 104 patchSG0004050.eoe_sw64
MD5 checksum: 65A02D0562E0F41752363927E3CBC7F4
Filename: patchSG0004050.idb
Algorithm #1 (sum -r): 55544 16 patchSG0004050.idb
Algorithm #2 (sum): 31605 16 patchSG0004050.idb
MD5 checksum: 143E7D4B9E38E604A4F35D504FCAFF28
Filename: patchSG0004050.netman_data_man
Algorithm #1 (sum -r): 56900 15 patchSG0004050.netman_data_man
Algorithm #2 (sum): 58999 15 patchSG0004050.netman_data_man
MD5 checksum: 42BEB35E700813967F637E9BB0640385
Filename: patchSG0004050.nfs_man
Algorithm #1 (sum -r): 05186 17 patchSG0004050.nfs_man
Algorithm #2 (sum): 21113 17 patchSG0004050.nfs_man
MD5 checksum: F090E7476C01DC64F12F3A094EFAD64B
Filename: patchSG0004050.nfs_sw
Algorithm #1 (sum -r): 48229 83 patchSG0004050.nfs_sw
Algorithm #2 (sum): 63547 83 patchSG0004050.nfs_sw
MD5 checksum: 093B835EDC966A30980D914149BED1F0
Filename: README.patch.4060
Algorithm #1 (sum -r): 25834 8 README.patch.4060
Algorithm #2 (sum): 56040 8 README.patch.4060
MD5 checksum: 3933F2BD23E7938470897FB7A41A2ABA
Filename: patchSG0004060
Algorithm #1 (sum -r): 04186 3 patchSG0004060
Algorithm #2 (sum): 43387 3 patchSG0004060
MD5 checksum: 8C75989D7B115A2331C9BA1BC7050A6A
Filename: patchSG0004060.eoe_sw
Algorithm #1 (sum -r): 45231 59 patchSG0004060.eoe_sw
Algorithm #2 (sum): 33048 59 patchSG0004060.eoe_sw
MD5 checksum: 3405CD896D8988610F25B92D1B30C252
Filename: patchSG0004060.idb
Algorithm #1 (sum -r): 53422 1 patchSG0004060.idb
Algorithm #2 (sum): 34568 1 patchSG0004060.idb
MD5 checksum: 283FE372DC8359C7AA87EC00F9BEA48A
- ------------------------
- --- 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
cse-security-alert@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 information and patches
is sgigate.sgi.com (204.94.209.1). Security information and patches
are located under the directories ~ftp/security and ~ftp/patches,
respectively.
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
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subscribe wiretap <YourEmailAddress>
end
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In the example above, <YourEmailAddress> is the email address that you
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------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
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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 ******]
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