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UNIRAS Brief - 381/03 Solaris 8 and Solaris 9 a Buffer Overflow in the LDAP Name Service.



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 381/03 dated 03.07.03  Time: 15:15
 UNIRAS is part of NISCC(National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Sun Alert ID: 52222 - In Solaris 8 and Solaris 9 a Buffer Overflow in the
LDAP Name Service May Lead to Unauthorized Root Access

Detail
====== 

On Solaris 8 and Solaris 9 systems with the LDAP name service enabled,
an unprivileged local user may be able to gain unauthorized root
access due to a buffer overflow in the "nss_ldap.so.1" library.




                ESB-2003.0461 -- Sun(sm) Alert Notification
 Sun Alert ID: 52222 - In Solaris 8 and Solaris 9 a Buffer Overflow in the
          LDAP Name Service May Lead to Unauthorized Root Access
                               03 July 2003


Product:                LDAP Name Service
Publisher:              Sun Microsystems
Operating System:       Solaris 9
                        Solaris 8
Platform:               SPARC
                        i386
Impact:                 Root Compromise
Access Required:        Existing Account

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   DOCUMENT ID: 52222
   SYNOPSIS: In Solaris 8 and Solaris 9 a Buffer Overflow in the LDAP
   Name Service May Lead to Unauthorized Root Access
   DETAIL DESCRIPTION:
   
Sun(sm) Alert Notification

     * Sun Alert ID: 52222
     * Synopsis: In Solaris 8 and Solaris 9 a Buffer Overflow in the LDAP
       Name Service May Lead to Unauthorized Root Access
     * Category: Security
     * Product: Solaris
     * BugIDs: 4830525
     * Avoidance: Workaround
     * State: Committed
     * Date Released: 26-Mar-2003
     * Date Closed:
     * Date Modified:
       
1. Impact

   On Solaris 8 and Solaris 9 systems with the LDAP name service enabled,
   an unprivileged local user may be able to gain unauthorized root
   access due to a buffer overflow in the "nss_ldap.so.1" library.
   
2. Contributing Factors

   This issue can occur in the following releases:
   
   SPARC Platform
     * Solaris 8
     * Solaris 9
       
   x86 Platform
     * Solaris 8
     * Solaris 9
       
   Note: Solaris 2.6 and Solaris 7 are not affected.
   
   Solaris 2.5.1 will not be evaluated regarding the potential impact of
   the issue described in this Sun Alert document.
   
   Only Solaris 8 and Solaris 9 systems with the LDAP name service
   enabled in the "/etc/nsswitch.conf" file for any of the following
   databases are affected by this issue:
     * bootparams
     * ethers
     * hosts
     * ipnodes
     * netgroup
     * netmasks
     * networks
       
   The LDAP name service is enabled for a database if the "ldap" keyword
   is present in the "/etc/nsswitch.conf" as shown for the "hosts",
   "networks", and "netgroup" databases in the following example:
    $ grep ldap /etc/nsswitch.conf
    hosts:      ldap dns [NOTFOUND=return] files
    networks:   ldap [NOTFOUND=return] files
    netgroup:   ldap
                            

3. Symptoms

   There are no predictable symptoms that would show the described issue
   has been exploited to gain root privileges.
   SOLUTION SUMMARY:
   
4. Relief/Workaround

   To work around the described issue, edit the "/etc/nsswitch.conf" file
   to not use LDAP with the following databases (i.e. remove the "ldap"
   keyword for these database entries):
     * bootparams
     * ethers
     * hosts
     * ipnodes
     * netgroup
     * netmasks
     * networks
       
   For example, edit the following line in "/etc/nsswitch.conf" from:
    hosts:      ldap dns [NOTFOUND=return] files                        

   to
    hosts:      dns [NOTFOUND=return] files                        

   Editing the "/etc/nsswitch.conf" file requires root access rights.
   
5. Resolution

   A final resolution is pending completion.
   
   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 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved.


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contained in this Briefing. 
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<End of UNIRAS Briefing>
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