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Category:   Application (Generic)  >   Performance Co-Pilot (PCP) Vendors:   SGI (Silicon Graphics)
(SGI Issues Fix for IRIX) Re: SGI's Performance Co-Pilot (PCP) Suite Lets Local Users Obtain Root Level Privileges on the Server
SecurityTracker Alert ID:  1004622
SecurityTracker URL:  http://securitytracker.com/id/1004622
CVE Reference:   CVE-2001-0823   (Links to External Site)
Date:  Jun 25 2002
Impact:   Execution of arbitrary code via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability has been reported in SGI's Performance Co-Pilot (PCP) system management framework that allows local users to get root level privileges.

The vulnerability is reportedly a symlink handling problem in the pmpost utility, designed to manage text messages. The pmpost utility will reportedly follow symlinks. If the linked file is configured with setuid root privileges, this will allow a local user to obtain root level privileges.

A demonstration exploit script is provided in the Source Message.

Impact:   A local user can obtain root level privileges on the host.
Solution:   SGI has issued a fix for IRIX in IRIX 6.5.13 and later versions. The vendor has not provided patches and recommends upgrading your operating system.

SGI has also provided the following workaround:

% su -
# /sbin/chmod 555 /usr/pcp/bin/pmpost
# exit
%

This workaround will disable the ability for non-root processes to append to /var/adm/pcplog/NOTICES.

Vendor URL:  oss.sgi.com/projects/pcp/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (SGI/IRIX)
Underlying OS Comments:  6.5.12 and prior versions

Message History:   This archive entry is a follow-up to the message listed below.
Jun 19 2001 SGI's Performance Co-Pilot (PCP) Suite Lets Local Users Obtain Root Level Privileges on the Server



 Source Message Contents

Subject:  IRIX pmpost vulnerability


-----BEGIN PGP SIGNED MESSAGE-----

_____________________________________________________________________________

                          SGI Security Advisory

        Title:      pmpost vulnerability
        Number:     20010601-01-I
        Date:       June 24, 2002
        Reference:  SGI Security Advisory 20010601-01-A
        Reference:  CVE-2001-0823
_____________________________________________________________________________

- -----------------------
- --- Issue Specifics ---
- -----------------------

It's been reported that the Performance Co-Pilot /usr/pcp/bin/pmpost utility
can be manipulated by a malicious user to append to critical system files.
This capability could be used to cause a root exploit.

This issue was originally reported in SGI Security Bulletin 20010601-01-A:
ftp://patches.sgi.com/support/free/security/advisories/20010601-01-A

See http://www.securityfocus.com/archive/1/191831 for further 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 the 6.5.13 and later releases of IRIX.


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

The pmpost binary is part of the Performance Co-Pilot package
(pcp_eoe.sw.eoe) and is not installed by default on IRIX 6.5 systems.

To determine the version of IRIX you are running, execute the following
command:

  # uname -R

That will return a result similar to the following:

  # 6.5 6.5.16f

The first number ("6.5") is the release name, the second ("6.5.16f" in this
case) is the extended release name.  The extended release name is the
"version" we refer to throughout this document.

To see if pmpost is installed, execute the following command:

  # versions long | grep pmpost
  f 47407    43 pcp_eoe.sw.eoe          usr/pcp/bin/pmpost

If the results returned are similar to the above, pmpost is installed and
the system may be vulnerable.

This vulnerability was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0823


- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

SGI understands that there are times when upgrading the operating system is
inconvenient or not possible.  In those instances, we recommend the
following workaround:

  % su -
  # /sbin/chmod 555 /usr/pcp/bin/pmpost
  # exit
  %

This workaround will disable the ability for non-root processes to append
to /var/adm/pcplog/NOTICES.


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

SGI has not provided patches for these vulnerabilities. Our recommendation
is to upgrade to IRIX 6.5.13 or later.

   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        no
   IRIX 6.5.14        no
   IRIX 6.5.15        no
   IRIX 6.5.16        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) 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/

     3) Upgrade to IRIX 6.5.13 or later.

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

SGI wishes to thank Paul Starzetz and the users of the Internet Community at
large for their assistance in this matter.


- -------------
- --- Links ---
- -------------

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
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------

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
      includes its valid PGP signature.


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-----END PGP SIGNATURE-----
    Copyright 2001, Silicon Graphics, Inc. All Rights Reserved.
    http://wwww.sgi.com/support/security/


 
 


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