Multiple Local Sendmail Vulnerabilities

["SGI Security Coordinator" <agent99 () sgi com>]

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______________________________________________________________________________
                          SGI Security Advisory

        Title:   Multiple Local Sendmail Vulnerabilities
        Number:  20011101-01-I
     Reference:  CVE CAN-2001-0714 and CAN-2001-0715
          Date:  November 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.
______________________________________________________________________________


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

The Sendmail mail delivery subsystem is vulnerable to multiple
local attacks that lead to information loss, disclosure of
possibly sensitive information and possible mail system compromise.

Sendmail versions before 8.12.1, without the "RestrictQRun"
option enabled, allow local users to obtain potentially
sensitive information about the mail queue by setting flags to
enable debug mode.

All versions of Sendmail allow any user to process the whole
mail queue unless this feature is disabled by the administrator.
Due to a programming bug, specific attacker-specified mail delivery
options will be honored. It is possible to, for example, force Sendmail
to drop queue contents by setting initial message hop count above the
limit.

Systems that do not allow users to run the queue ("RestrictQRun"
option) are not vulnerable to these exploits. "RestrictQRun" is
not set by default.

SGI has investigated these issues and recommends the following
steps for neutralizing the exposure.  It is HIGHLY RECOMMENDED
that these measures be implemented on ALL vulnerable SGI
systems.



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

The sendmail daemon is installed by default on IRIX.

A local user account on the vulnerable system is required in order
to exploit the sendmail daemon.

These sendmail vulnerabilities were assigned the following CVEs:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0714
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0715

This issue was reported by BindView RAZOR team:
http://razor.bindview.com/publish/advisories/adv_sm812.html

These sendmail vulnerabilities have been publicly discussed in
Usenet newsgroups and security mailing lists.


- --------------------------
- --- Temporary Solution ---
- --------------------------

The steps below can be used to configure sendmail so that users
are not allowed to run the queue.

     1) Become the root user on the system.

                % /bin/su -
                Password:
                #

     2) Edit the file /etc/sendmail.mc

                # vi  /etc/sendmail.mc

       {Add the following line}

       define(`confPRIVACY_FLAGS', `restrictqrun')dnl

       {Save the file and exit}


     3) Rebuild the sendmail.cf file from the modified
        sendmail.mc file.

                # /usr/etc/configmail mc2cf


     4) Stop and restart sendmail

                # /etc/init.d/mail stop
                # /etc/init.d/mail start


     5) Return to previous level.

                # exit
                %


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

Currently, there are no patches available from SGI to address these issues.

SGI recommends following the steps from the Temporary Solution section to
disable users from being able to run the queue.

All versions of IRIX are vulnerable to these exploits unless the
above steps are taken.


- -------------
- --- 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.


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

SGI wishes to thank the BindView RAZOR team 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.

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______________________________________________________________________________
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