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__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Samba Servers Vulnerability
September 30, 1997 18:00 GMT Number H-110
______________________________________________________________________________
PROBLEM: A vulnerability has been discovered in all versions of Samba.
PLATFORM: Servers running on Intel based platforms, specific to Intel
Linux servers.
DAMAGE: May allow unauthorized remote users to obtain root access.
SOLUTION: Samba version 1.9.17p2 is available from the ftp address
listed below.
______________________________________________________________________________
VULNERABILITY An exploit for this security hole has been posted to the
ASSESSMENT: internet so system administrators should assume that this hole
is being actively exploited.
______________________________________________________________________________
[ Start AUSCERT Advisory ]
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From: Andrew Tridgell <tridge@samba.anu.edu.au>
Subject: Security bugfix for Samba
Date: Fri, 26 Sep 1997 23:48:49 +1000
Security bugfix for Samba
-------------------------
A security hole in all versions of Samba has been recently
discovered. The security hole allows unauthorized remote users to
obtain root access on the Samba server.
An exploit for this security hole has been posted to the internet so
system administrators should assume that this hole is being actively
exploited.
The exploit for the security hole is very architecture specific and
has been only demonstrated to work for Samba servers running on Intel
based platforms. The exploit posted to the internet is specific to
Intel Linux servers. It would be very difficult to produce an exploit
for other architectures but it may be possible.
A new release of Samba has now been made that fixes the security
hole. The new release is version 1.9.17p2 and is available from
ftp://samba.anu.edu.au/pub/samba/samba-1.9.17p2.tar.gz
This release also adds a routine which logs a message if anyone
attempts to take advantage of the security hole. The message (in the
Samba log files) will look like this:
ERROR: Invalid password length 999
your machine may be under attack by a user exploiting an old bug
Attack was from IP=aaa.bbb.ccc.ddd
where aaa.bbb.ccc.ddd is the IP address of the machine performing the attack.
Please report any attacks to the appropriate authority.
The Samba Team
samba-bugs@samba.anu.edu.au
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[ End AUSCERT Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of AUSCERT & Andrew Tridgell
(Samba) 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
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 510-422-8193
FAX: +1 510-423-8002
STU-III: +1 510-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://ciac.llnl.gov/
Anonymous FTP: ciac.llnl.gov (198.128.39.53)
Modem access: +1 (510) 423-4753 (28.8K baud)
+1 (510) 423-3331 (28.8K baud)
CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. CIAC-NOTES for Notes, a collection of computer security articles;
3. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
4. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.
Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, ciac-notes, spi-announce OR spi-notes for list-name:
E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov:
subscribe list-name
e.g., subscribe ciac-notes
You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email. This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.
If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)
H-100: SunOS, Solaris libXt Vulnerability
H-101: FreeBSD procfs Vulnerability
H-102: SGI IRIX webdist.cgi, handler and wrap programs Vulnerabilities
H-103: HP-UX X11/Motif Libraries Vulnerability
H-104: HP-UX libXt Vulnerability
H-105: HP-UX vuefile, vuepad, dtfile, & dtpad Vulnerabilities
H-106: SGI IRIX LOCKOUT & login/scheme Vulnerabilities
H-107: UNIX Buffer Overflow in rdist Vulnerability
H-108: SunOS, Solaris libX11 Buffer Overflow Vulnerability
H-109: Solaris DCE and AFS Integrated login Vulnerability
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