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TUCoPS :: Unix :: General :: n-030.txt

Sendmail Restricted Shell smrsh and check_relay vulnerabilities (CIAC N-030)


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

                             INFORMATION BULLETIN

              Sendmail Restricted Shell (smrsh) and Check_Relay Vulnerabilities
December 19, 2002 21:00 GMT                                       Number N-030
[REVISED 20 December 2002]
[REVISED 10 January 2003]
[REVISED 1 October 2003]
PROBLEM:   1) Sendmail Restricted Shell (smrsh) may let local users bypass
           restrictions to execute code, or possibly gain root access.
           2) A remote user with the ability to control a DNS server or 
           spoof the DNS may be able to bypass a target server's sendmail
           access controls and send mail to or via that server.
PLATFORM:  Multiple vendor products might be affected when used in
	       conjunction with Sendmail, such as Linux and UNIX.
           HP-UX B.11.00, B.11.11, B.11.22 running sendmail version 8.11.1 only
DAMAGE:    1) The potential vulnerability may allow authorized users to
           execute unauthorized programs.
	       2) A remote user with ability to spoof the DNS can bypass 
           sendmail access controls and send mail to or through the server.
SOLUTION:  Check with your vendor for platform-specific solutions. has released 8.12.7, which corrects these
VULNERABILITY  The risk is MEDIUM.  1) The vulnerability is only exploitable 
ASSESSMENT:    by local users and only allows execution of unauthorized programs.
               2) Only a remote user who already has the ability to control a 
               DNS server or spoof a DNS could exploit this vulnerability.
REVISION HISTORY:  10/1/03 - Added Hewlett Packard's link and updated the 
                             Hewlett Packard's Security Bulletin HPSBUX0212-234
                             SSRT2432 smrsh restrictions bypass (rev 2.)


**REVISED 02**
 Originally issued: 19 December 2002
 Last revision: 30 September 2003
 SSRT2432  smrsh restrictions bypass (rev.2)

NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible.  Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

PROBLEM:  Sendmail Restricted Shell (smrsh) may let local users
          bypass restrictions to execute code.

IMPACT: The potential vulnerability may allow authorized users
        to execute unauthorized programs.

PLATFORM: HP-UX B.11.00, B.11.11, B.11.22 running sendmail
          version 8.11.1 ONLY.

SOLUTION: B.11.22 - PHNE_28409 or subsequent
          B.11.11 - Web upgrade
          B.11.00 - Web upgrade

                Update B.11.00 and B.11.11.
                A patch is available for B.11.22.
                No manual action is required for B.11.22.

AVAILABILITY:  The patch and web upgrades are available now.

CHANGE SUMMARY: Rev.01 - Only sendmail version 8.11.1
                         is vulnerable.
                Rev.02 - Patch and web upgrades are available.
                         Added AFFECTED VERSIONS section.
 A. Background
    Sendmail Restricted Shell (smrsh) may let local users
    bypass restrictions to execute code.  The only vulnerable
    version delivered on HP-UX is sendmail 8.11.1.  This version
    is available as a web upgrade for HP-UX B.11.00 and B.11.11.
    Sendmail version 8.11.1 is delivered with HP-UX B.11.22.

**REVISED 02**

     The following is a list by HP-UX revision of
     affected filesets and the fileset revision or
     patch containing the fix.  To determine if a
     system has an affected version, search the
     output of "swlist -a revision -l fileset"
     for an affected fileset, then determine if
     a fixed revision or the applicable patch is

     HP-UX B.11.22
     fix: PHNE_28409 or subsequent

     HP-UX B.11.11
     fix: revision B. or subsequent
         (web upgrade to Sendmail 8.11.1 Version 5
          or subsequent)

     HP-UX B.11.00
     fix: revision B. or subsequent
         (web upgrade to Sendmail 8.11.1 Version 4
          or subsequent)


    HP Tru64 UNIX is not vulnerable to this reported problem.

 B. Recommended solution

**REVISED 02**
 -->HP-UX B.11.22 sendmail 8.11.1
        PHNE_28409 is now available.

 -->HP-UX B.11.00 and B.11.11 sendmail 8.11.1
        A web upgrade is available from

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(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company.  Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.


CIAC wishes to acknowledge the contributions of, Hewlett-Packard 
Company, Silicon Graphics, Inc., and for the information 
contained in this bulletin.

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
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    STU-III:  +1 925-423-2604

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This document was prepared as an account of work sponsored by an
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