TUCoPS :: SunOS/Solaris :: n-068.txt

Sun Solaris Buffer Overflow in lpq 1B Command (CIAC N-068)

             __________________________________________________________

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

                 Sun Solaris Buffer Overflow in lpq(1B) Command
                       [Sun(sm) Alert Notification 52443]

April 1, 2003 20:00 GMT                                           Number N-068
______________________________________________________________________________
PROBLEM:       A buffer overflow exists in the lpq(1B) command. 
PLATFORM:      * Solaris 2.6
               * Solaris 7 
DAMAGE:        By carefully crafting overflow data, a local attacker could run 
               arbitrary code with root privilege. 
SOLUTION:      Apply workaround or patches as stated in Sun's Alert 
               Notification. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. An attacker would need a legitimate account 
ASSESSMENT:    on the target machine to upgrade the privileges as described. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-068.shtml 
 ORIGINAL BULLETIN:                                                           
                     http://www.sunsolve.sun.com/pub-cgi/
                  retrieve.pl?doc=fsalert%2F52443&zone_32=category%3Asecurity 
______________________________________________________________________________

[***** Start Sun(sm) Alert Notification 52443 *****]

Sun(sm) Alert Notification 
Sun Alert ID: 52443 
Synopsis: Solaris Security Vulnerability due to a Buffer Overflow in lpq(1B) 
Category: Security 
Product: Solaris 
BugIDs: 4236546 
Avoidance: Patch 
State: Resolved 
Date Released: 31-Mar-2003 
Date Closed: 31-Mar-2003 
Date Modified: 31-Mar-2003 

1. Impact 

Local unprivileged users may be able to gain unauthorized root access due to 
a buffer overflow in the lpq(1B) command. 

This issue is described in NSFOCUS Security Bulletin SA2003-02 available from 
http://www.nsfocus.com/english/homepage/sa2003-02.htm. 

Sun acknowledges with thanks, NSFOCUS Information Technology, for bringing this 
issue to our attention. 

2. Contributing Factors
 
This issue can occur in the following releases: 

SPARC Platform 

Solaris 2.6 without patch 106235-12 
Solaris 7 without patch 107115-12 
x86 Platform 

Solaris 2.6 without patch 106236-12 
Solaris 7 without patch 107116-12 
Note: Solaris 2.5.1 will not be evaluated regarding the potential impact of the 
issue described in this Sun Alert document. 

Solaris 8 and Solaris 9 are not impacted by this issue. 

3. Symptoms 

There are no symptoms that would show the buffer overflow in lpq(1B) has been 
exploited to gain unauthorized root access to a host. Failed attempts to 
exploit lpq(1B) might result in a core file being generated. If file(1) was run 
on this core, it would show that it was produced from lpq(1B). 

Solution Summary Top 

4. Relief/Workaround 

To work around the described issue, remove the set-user-ID bit from lpstat(1). 
The lpq(1B) command is a symbolic link to lpstat(1) . This can be done with the 
following command as the root user: 

	# /usr/bin/chmod u-s /usr/bin/lpstat            
Note: Removing the set-user-ID bit from the lpstat(1) binary will prevent 
unprivileged users from displaying information about the print service. 

5. Resolution 

This issue is addressed in the following releases: 

SPARC Platform 

Solaris 2.6 with patch 106235-12 or later 
Solaris 7 with patch 107115-12 or later 
x86 Platform 

Solaris 2.6 with patch 106236-12 or later 
Solaris 7 with patch 107116-12 or later 

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. 

[***** End Sun(sm) Alert Notification 52443 *****]

_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Sun Microsystems, Inc. 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
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