TUCoPS :: SGI :: ciacl099.txt

CIAC L-099 - SGI PCP Pmpost Symlink Vulnerability


                       The U.S. Department of Energy
                     Computer Incident Advisory Center
                           ___  __ __    _     ___
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                             INFORMATION BULLETIN

                     SGI  PCP Pmpost  Symlink Vulnerability

                     [SGI Security Advisory 20010601-01-A]

June 25, 2001 21:00 GMT                                           Number L-099
PROBLEM:       The pmpost command of the Performance Co-Pilot (PCP) suite has 
               a symlink handling vulnerability. If this runs in root context 
               (i.e., setuid root), this could result in root compromise. 
PLATFORM:      IRIX, Linux: PCP suite versions 2.1.11-5 and before. 
DAMAGE:        Depending on configuration, this could result in root 
SOLUTION:      Apply the described workaround. Pmpost appends the text message 
               to the end of the PCP notice board file (IRIX: 
               /var/adm/pcplog/NOTICES, Linux: /var/adm/pcp/NOTICES), so 
               changing the permissions as described in the workaround will 
               prevent non-root processes from appending to this file. 
VULNERABILITY  MEDIUM to HIGH, depending on configuration. This can be a 
ASSESSMENT:    remotely exploitable root compromise, if pmpost runs in root 

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


                           SGI Security Advisory

         Title:  PCP pmpost vulnerability
        Number:  20010601-01-A
          Date:  June 19, 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.

SGI acknowledges the PCP pmpost vulnerability reported by Paul Starzetz on
BUGTRAQ http://www.securityfocus.com/archive/1/191831 and is currently
investigating.  No further information is available at this time.

As further information becomes available, additional advisories will be

For the protection of all our customers, SGI does not disclose, discuss
or confirm vulnerabilities until a full investigation has occurred and
any necessary patch(es) or release streams are available for all vulnerable
and supported Linux and IRIX operating systems.

Until SGI has more definitive information to provide, customers are
encouraged to assume all security vulnerabilities as exploitable and take
appropriate steps according to local site security policies and requirements.

To minimize the pmpost vulnerability until patches are made available run
the following command as root:

On IRIX:   /sbin/chmod 555 /usr/pcp/bin/pmpost
On Linux:  chmod 555 /usr/share/pcp/bin/pmpost

This workaround will disable the ability for non-root processes to append
to /var/adm/pcplog/NOTICES (IRIX) or /var/log/pcp/NOTICES (Linux).

As further information becomes available, additional advisories will be
issued via the normal SGI security information distribution methods
including the wiretap mailing list.

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Version: 2.6.2


[******  End SGI Advisory ******]


CIAC wishes to acknowledge the contributions of SGI  for the 
information contained in this bulletin.

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