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AUSCERT External Security Bulletin Redistribution
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
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AusCERT Security Bulletin Summary
---------------------------------
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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