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AUSCERT External Security Bulletin Redistribution
ESB-98.095 -- Sun Security Bulletin #00171
11 June 1998
Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability the in.ftpd program. This vulnerability can be exploited
to launch a denial of service attack against the ftp server.
The following security bulletin is provided as a service to AusCERT's
members. As AusCERT did not write this document, AusCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It will
not be updated when the original bulletin is. If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.
Contact information for SUN is included in the Security Bulletin below.
If you have any questions or need further information, please contact them
Previous advisories and external security bulletins can be retrieved from:
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00171
Date: June 10, 1998
The information contained in this Security Bulletin is provided "AS IS."
Sun makes no warranties of any kind whatsoever with respect to the information
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.
IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE,
PROFIT OR DATA, OR FOR DIRECT, SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL
OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY
ARISING OUT OF THE USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN
THIS SECURITY BULLETIN, EVEN IF SUN MICROSYSTEMS, INC. HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
If any of the above provisions are held to be in violation of applicable law,
void, or unenforceable in any jurisdiction, then such provisions are waived
to the extent necessary for this disclaimer to be otherwise enforceable in
1. Bulletins Topics
Sun announces the release of patches for Solaris(tm) 2.6, 2.5.1, 2.5
and 2.3 (SunOS(tm) 5.6, 5.5.1, 5.5 and 5.3), which relate to a
vulnerability in ftpd.
Sun estimates that the release of patches for Solaris 2.4 (SunOS 5.4)
that relate to the same vulnerability will be available within 6 weeks
of the date of this bulletin.
Sun strongly recommends that you install the patches listed in section 4
immediately on systems running SunOS 5.6, 5.6_x86, 5.5.1, 5.5, and 5.3
which use in.ftpd.
2. Who is Affected
Vulnerable: SunOS 5.6, 5.6_x86, 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
5.4, 5.4_x86 and 5.3.
Not vulnerable: All other supported versions of SunOS.
3. Understanding the Vulnerability
The in.ftpd daemon is the Internet File Transfer Protocol (FTP) server
process. The server is invoked by the Internet daemon inetd each time
a connection to the FTP service is made. A vulnerability has been
discovered which could be exploited to launch an denial of service
attack against the ftp server.
4. List of Patches
The following patches are available in relation to the above problem.
SunOS Patch ID
SunOS 5.6 106301-01
SunOS 5.6_x86 106302-01
SunOS 5.5.1 103603-08
SunOS 5.5.1_x86 103604-08
SunOS 5.5 103577-08
SunOS 5.5_x86 103578-08
SunOS 5.4 101945-59 (to be released in 6 weeks)
SunOS 5.4_x86 101946-52 (to be released in 6 weeks)
SunOS 5.3 104938-02
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
B. Checksums for the patches listed in this bulletin are available via
World Wide Web at:
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D. Sun Security Coordination Team's PGP key is available via World Wide Web
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Copyright 1998 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries. This
Security Bulletin may be reproduced and distributed, provided that this
Security Bulletin is not modified in any way and is attributed to
Sun Microsystems, Inc. and provided that such reproduction and distribution
is performed for non-commercial purposes.
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