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Internet Security Systems Security Advisory
June 19, 2001

Remote Buffer Overflow Vulnerability in Solaris Print Protocol Daemon

Synopsis:

ISS X-Force has discovered a buffer overflow in the Solaris line printer
daemon (in.lpd) that may allow a remote or local attacker to crash the 
daemon or execute arbitrary code with super user privilege. This daemon
runs with root privileges by default on all current Solaris versions.   

Impact:

Solaris installs the in.lpd line printer software by default. This 
vulnerability may allow a remote attacker to execute arbitrary commands
without restriction. No local access to the target system is required 
to exploit this vulnerability.

Affected Versions:

Solaris 2.6
Solaris 2.6 x86
Solaris 7
Solaris 7 x86
Solaris 8
Solaris 8 x86

Description:

The Solaris BSD print protocol daemon provides an interface for remote
users to interact with a local printer. The in.lpd daemon listens on
the network for remote requests on port 515. By listening for remote 
requests, there is an opportunity for a malicious user to exploit this
vulnerability remotely. The in.lpd daemon provides extensive 
functionality to network users who intend to print documents over a 
network.  There is a flaw in the “transfer job” routine, which may 
allow attackers to overflow an unchecked buffer. Attackers may exploit
this vulnerability to crash the printer daemon, or execute arbitrary 
code as super user on a target system.

All current versions of Solaris install and enable the in.lpd daemon
by default.

Recommendations:

Sun Microsystems has informed ISS X-Force that patches are in 
development and will be made available in July. 

Sun Microsystems has provided ISS X-Force with following patch 
information.  ISS X-Force recommends installing a patch for this
vulnerability when they are made available.

106235-09 SunOS 5.6: lp patch
106236-09 SunOS 5.6_x86: lp patch
107115-08 SunOS 5.7: LP patch
107116-08 SunOS 5.7_x86: LP patch
109320-04 SunOS 5.8: LP patch
109321-04 SunOS 5.8_x86: LP patch

Until these patches are released, ISS X-Force recommends that the in.lpd
daemon be disabled on all vulnerable systems. To disable the in.lpd daemon:

1.	Change user to root.
2.	Open /etc/inetd.conf in any text editor.
3.	Search for the line beginning with “printer”.
4.	Insert a coment, or “#” character at the beginning of this line.
5.	Restart inetd.

ISS X-Force recommends that all unused daemons or services be disabled
to prevent exposure to both known and unknown vulnerabilities.

ISS X-Force will provide detection and assessment support for this
vulnerability in future X-Press Updates for ISS RealSecure and ISS 
Internet Scanner.

Additional Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2001-0353 to this issue. This is a candidate for inclusion in
the CVE list (<http://cve.mitre.org>), which standardizes names for 
security problems. 

______

About Internet Security Systems (ISS) 

Internet Security Systems is the leading global provider of security 
management solutions for the Internet, protecting digital assets and 
ensuring safe and uninterrupted e-business. With its industry-leading 
intrusion detection and vulnerability assessment, remote managed 
security services, and strategic consulting and education offerings, ISS
is a trusted security provider to more than 8,000 customers worldwide
including 21 of the 25 largest U.S. commercial banks and the top 10 U.S. 
telecommunications companies. Founded in 1994, ISS is headquartered in 
Atlanta, GA, with additional offices throughout North America and 
international operations in Asia, Australia, Europe, Latin America and
the Middle East. For more information, visit the Internet Security 
Systems web site at www.iss.net or call 888-901-7477.


Copyright (c) 2001 Internet Security Systems, Inc.

Permission is hereby granted for the redistribution of this Alert
electronically. It is not to be edited in any way without express
consent of the X-Force. If you wish to reprint the whole or any part of
this Alert in any other medium excluding electronic medium, please
e-mail xforce@iss.net for permission.

Disclaimer

The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO warranties with regard to this information. In no event shall the
author be liable for any damages whatsoever arising out of or in 
connection with the use or spread of this information. Any use of this
information is at the user's own risk.


X-Force PGP Key available at: http://xforce.iss.net/sensitive.php
as well as on MIT's PGP key server and PGP.com's key server.

Please send suggestions, updates, and comments to: X-Force
xforce@iss.net of Internet Security Systems, Inc.
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