TUCoPS :: SGI :: ciacl080.txt

CIAC L-080 - SGI IRIX rpc espd Buffer Overflow - remote root!


                       The U.S. Department of Energy
                     Computer Incident Advisory Center
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN

                       SGI IRIX rpc.espd Buffer Overflow
                     [SGI Security Advisory 20010501-01-P]

May 12, 2001 01:00 GMT                                            Number L-080
PROBLEM:       An exploitable buffer overflow has been discovered in the
               Embedded Support Partner (ESP) daemon rpc.espd.
PLATFORM:      IRIX 6.5.5 through IRIX 6.5.8 are vulnerable. 
               IRIX 6.5.7 and IRIX 6.5.8 systems with patch 4123 are not                           
               IRIX 6.5.9 and above are not vulnerable to this issue.
DAMAGE:        root compromise.
SOLUTION:      Apply the patches described below.
VULNERABILITY  VERY HIGH. This is remotely exploitable, and results in a root
ASSESSMENT:    compromise.

[****** Start SGI Advisory ******]

                          SGI Security Advisory

        Title:     IRIX rpc.espd Buffer Overflow
        Reference: CVE CAN-2001-0331
        Number:    20010501-01-P
        Date:      May 9, 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 ---
- -----------------------

Embedded Support Partner (ESP) is an infrastructure that is integrated
into the IRIX operating system for the purposes of support.

Internet Security Systems (ISS) X-Force has reported that an exploitable
buffer overflow has been discovered in ESP daemon rpc.espd 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 has been corrected
in ESP 2.0 for IRIX 6.5.9 and above.

- --------------
- --- Impact ---
- --------------

The ESP(1) platform is installed by default on IRIX 6.5.5 and above.
IRIX 6.5.5 through IRIX 6.5.8 are vulnerable.
IRIX 6.5.7 and IRIX 6.5.8 systems with patch 4123 are not vulnerable.
IRIX 6.5.9 and above are not vulnerable to this issue.

A local user account on the vulnerable system is not required in order
to exploit rpc.espd daemon.  The rpc.espd daemon can be exploited remotely
over an untrusted network.

The exploitable buffer overflow vulnerability can lead to a root compromise.

This rpc.espd buffer overflow vulnerability was reported by ISS X-Force:

The CVE candidate for this vulnerability is:

- --------------------------
- --- 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 rpc.espd daemon to prevent
exploitation of this vulnerability until patches can be installed.

     1) Become the root user on the system.

                % /bin/su -

     2) Change the permissions on the rpc.espd daemon.

                # /bin/chmod -x /usr/etc/rpc.espd

     3) Restart inetd to kill any vulnerable running daemons.

                # /etc/killall -HUP inetd

     4) Return to previous level.

                # exit

- ----------------
- --- Solution ---
- ----------------

The ESP security issue has been fixed in ESP 2.0 for IRIX 6.5.9 and above,
and in patch 4123 for IRIX 6.5.7 and 6.5.8.

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------

   IRIX 3.x          no                        Note 1
   IRIX 4.x          no                        Note 1
   IRIX 5.x          no                        Note 1

   IRIX 6.0.x        no                        Note 1
   IRIX 6.1          no                        Note 1
   IRIX 6.2          no                        Note 1
   IRIX 6.3          no                        Note 1
   IRIX 6.4          no                        Note 1

   IRIX 6.5          no                        Note 1
   IRIX 6.5.1        no                        Note 1
   IRIX 6.5.2        no                        Note 1
   IRIX 6.5.3        no                        Note 1
   IRIX 6.5.4        no                        Note 1
   IRIX 6.5.5        yes                       Note 1 & 3
   IRIX 6.5.6        yes                       Note 1 & 3
   IRIX 6.5.7        yes           4123        Note 1 & 3
   IRIX 6.5.8        yes           4123        Note 1 & 3
   IRIX 6.5.9        no                        Note 1
   IRIX 6.5.10       no                        Note 2
   IRIX 6.5.11       no                        Note 4


     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:
        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

SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and

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:

SGI fixes for SGI open sourced code can be found on:

SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or

SGI patches for Windows NT or 2000 can be found at:

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:

IRIX 6.5 Software Update CDs can be obtained from:

The primary SGI anonymous FTP site for security advisories and patches
is patches.sgi.com (  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.4123
Algorithm #1 (sum -r):    42191 57 README.patch.4123
Algorithm #2 (sum):       8760 57 README.patch.4123
MD5 checksum:             50335F5A79F4E7E1341BFC2D6E7EBA61

Filename:                 patch4123.chksums.only
Algorithm #1 (sum -r):    27629 1 patch4123.chksums.only
Algorithm #2 (sum):       11216 1 patch4123.chksums.only
MD5 checksum:             49D94C480E673A31450E9900627EC0E4

Filename:                 patch4123.pgp.and.chksums
Algorithm #1 (sum -r):    32624 2 patch4123.pgp.and.chksums
Algorithm #2 (sum):       63277 2 patch4123.pgp.and.chksums
MD5 checksum:             994CCCFAA8D9F32189ECD9E56AA7EC4D

Filename:                 patchSG0004123
Algorithm #1 (sum -r):    63263 6 patchSG0004123
Algorithm #2 (sum):       61222 6 patchSG0004123
MD5 checksum:             690830DDB9E6AD6B8204B8ABB4DC7355

Filename:                 patchSG0004123.eoe_books
Algorithm #1 (sum -r):    17575 13187 patchSG0004123.eoe_books
Algorithm #2 (sum):       56328 13187 patchSG0004123.eoe_books
MD5 checksum:             8DB739C7EC99953046FCB36683F4A19E

Filename:                 patchSG0004123.eoe_man
Algorithm #1 (sum -r):    32417 132 patchSG0004123.eoe_man
Algorithm #2 (sum):       61773 132 patchSG0004123.eoe_man
MD5 checksum:             7C674D827EEED0DF8DD68A48C722EE6C

Filename:                 patchSG0004123.eoe_sw
Algorithm #1 (sum -r):    53412 10081 patchSG0004123.eoe_sw
Algorithm #2 (sum):       33482 10081 patchSG0004123.eoe_sw
MD5 checksum:             23303AE759B3CEA75CE9CE3E56215829

Filename:                 patchSG0004123.eoe_sw64
Algorithm #1 (sum -r):    18041 19 patchSG0004123.eoe_sw64
Algorithm #2 (sum):       8176 19 patchSG0004123.eoe_sw64
MD5 checksum:             D6B07A95299A25B4D5C3A48C55DF6F43

Filename:                 patchSG0004123.idb
Algorithm #1 (sum -r):    40104 247 patchSG0004123.idb
Algorithm #2 (sum):       23426 247 patchSG0004123.idb
MD5 checksum:             4B4FD1F676A230169E598904EACFAC1D

- ------------------------
- --- Acknowledgments ----
- ------------------------

SGI wishes to thank Internet Security Systems (ISS) X-Force for their
assistance in this matter.

- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------

If there are questions about this document, email can be sent to


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 (  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:

For issues with the patches on the FTP sites, email can be sent to

For assistance obtaining or working with security patches, please
contact your SGI support provider.


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>

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
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SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .


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 Advisory ******]

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
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