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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  ]

- ------------------------------------------------------------------------------
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
- ------------------------------------------------------------------------------


[  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.

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This document was prepared as an account of work sponsored by an
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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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