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             AUSCERT External Security Bulletin Redistribution

                        ESB-2006.0293 -- [Solaris]
  Privileged Applications Linked to libpkcs11(3LIB) Which Obtain Password
           Entries Using getpwnam(3C) May Fail or Possibly Grant
                    Elevated Privileges to Local Users
                               26 April 2006

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libpksc11
Publisher:         Sun Microsystems
Operating System:  Solaris 10
Impact:            Increased Privileges
                   Execute Arbitrary Code/Commands
Access:            Existing Account

Original Bulletin:
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102316-1

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Sun(sm) Alert Notification
     * Sun Alert ID: 102316
     * Synopsis: Privileged Applications Linked to libpkcs11(3LIB) Which
       Obtain Password Entries Using getpwnam(3C) May Fail or Possibly
       Grant Elevated Privileges to Local Users
     * Category: Security
     * Product: Solaris 10 Operating System
     * BugIDs: 6372587
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 24-Apr-2006
     * Date Closed: 24-Apr-2006
     * Date Modified: 

1. Impact

   If a privileged application links to the libpkcs11(3LIB) library and
   utilizes the getpwnam(3C) family of non-reentrant functions to obtain
   password entries, then it may be possible for a local unprivileged
   user to execute arbitrary code with the privileges of the application
   depending on the way the application uses data provided by
   getpwnam(3C) and related functions. The application may also fail due
   to receiving unexpected data from one of the non-reentrant
   getpwnam(3C) functions.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 10 without patch 118918-14 [Global]
     * Solaris 10 without patch 118562-09 [Restricted]

   x86 Platform
     * Solaris 10 without patch 118919-12 [Global]
     * Solaris 10 without patch 118563-07 [Restricted]

   Note: Solaris 8 and Solaris 9 are not affected by this issue.

   To determine if an application links to the libpkcs11(3LIB) library
   the ldd(1) command can be used:
    $ ldd /usr/sbin/in.telnetd | grep pkcs11
    libpkcs11.so.1 =>        /usr/lib/libpkcs11.so.1

   To determine if an application utilizes one of the getpwnam(3C) family
   of non-reentrant functions, the nm(1) command may work if the
   application binary has not been stripped using strip(1). The file(1)
   command will report if a binary has been stripped. If it hasn't, then
   nm(1) can be used to look for the getpwnam(3C) functions:
    $ file /bin/id
    /bin/id:        ELF 32-bit LSB executable 80386 Version 1,
    dynamically linked, not stripped, no debugging information available

    $ nm /bin/id |grep getpw
        | 134548064|       0|FUNC |GLOB |0    |UNDEF  |getpwnam
        | 134548272|       0|FUNC |GLOB |0    |UNDEF  |getpwuid

   Alternatively, the truss(1) utility can be used to determine if an
   application calls one of the getpwnam(3C) non-reentrant functions:
    $ truss -f -t\!all -ulibc:*getpw*: /bin/id
    5999/1@1:       -> libc:getpwuid(0x17fa6)
    5999/1@1:       <- libc:getpwuid() = 0x80637a4

   Note: This issue does not affect applications which utilize the
   reentrant interfaces for the getpwnam(3C) functions: getpwnam_r(),
   getpwuid_r(), getpwent_r(), and fgetpwent_r().

3. Symptoms

   There are no reliable symptoms that would show if this issue has been
   exploited to execute arbitrary commands with elevated privileges on a
   system. 

4. Relief/Workaround

   There is no workaround. Please see the "Resolution" section below.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 10 with patch 118918-14 or later [Global]
     * Solaris 10 with patch 118562-09 or later [Restricted]

   x86 Platform
     * Solaris 10 with patch 118919-12 or later [Global]
     * Solaris 10 with patch 118563-07 or later [Restricted]

   This Sun Alert notification is being provided to you on an "AS IS"
   basis. This Sun Alert notification may contain information provided by
   third parties. The issues described in this Sun Alert notification may
   or may not impact your system(s). Sun makes no representations,
   warranties, or guarantees as to the information contained herein. ANY
   AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
   NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
   YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
   OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
   This Sun Alert notification contains Sun proprietary and confidential
   information. It is being provided to you pursuant to the provisions of
   your agreement to purchase services from Sun, or, if you do not have
   such an agreement, the Sun.com Terms of Use. This Sun Alert
   notification may only be used for the purposes contemplated by these
   agreements.

   Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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