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PROGENY LINUX SYSTEMS -- SECURITY ADVISORY PROGENY-SA-2001-05
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Topic: Samba /tmp vulnerabilities
Category: net
Modules: samba smbclient
Announced: 2001-04-18
Credits: Marcus Meissner <Marcus.Meissnerat_private>
Affects: Progeny Debian (samba, smbclient prior to 2.0.7-3.2)
Debian GNU/Linux (samba, smbclient prior to 2.0.7-3.2)
Vendor-Status: New Version Released
(samba_2.0.7-3.2, smbclient_2.0.7-3.2)
Corrected: 2001-04-18
Progeny Only: NO
$Id: PROGENY-SA-2001-05,v 1.11 2001/04/18 17:53:55 jdaily Exp $
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SYNOPSIS
smbclient and samba use /tmp files in an insecure manner, allowing
local users to overwrite files to which they would ordinarily not have
access.
PROBLEM DESCRIPTION
Marcus Meissner discovered that Samba was not creating temporary
files safely. This happened in two places:
* When a remote user queried a printer queue, samba would create a
temporary file in which the queue's data would be written. This was
using a predictable filename, and doing it insecurely, allowing a
local attacker to trick samba into overwriting files it shouldn't.
* The smbclient "more" and "mput" commands also created temporary
files in /tmp insecurely.
Both problems have been fixed in version 2.0.7-3.2. We recommend
that you upgrade your samba package immediately.
IMPACT
Local users can overwrite system files, causing corruption and
potentially gaining root access.
SOLUTION
Upgrade to a fixed version of samba. Samba versions 2.0.8 and 2.2.0
correct the problem. For your convenience, you may upgrade to the
packages smbclient_2.0.7-3.2, samba-common_2.0.7-3.2, and
samba_2.0.7-3.2.
WORKAROUND
No known workaround exists for this vulnerability.
UPDATING VIA APT-GET
1. Ensure that your /etc/apt/sources.list file has a URI for Progeny's
update repository:
deb http://archive.progeny.com/progeny updates/newton/
2. Update your cache of available packages for apt(8).
Example:
# apt-get update
3. Using apt(8), install the new package. apt(8) will download the
update, verify its integrity with md5, and then install the
package on your system with dpkg(8).
Example:
# apt-get install samba smbclient
UPDATING VIA DPKG
1. Using your preferred FTP/HTTP client to retrieve the following
updated files from Progeny's update archive at:
http://archive.progeny.com/progeny/updates/newton/
Filename MD5 Checksum
------------------------------------ --------------------------------
samba-common_2.0.7-3.2_i386.deb 7eabad23b6c221ec3cb50e6b41a7de99
samba_2.0.7-3.2_i386.deb 36fbb1a508503bc9c0844b5f98f98264
smbclient_2.0.7-3.2_i386.deb fe8c68a7cf5499e2b665e5ac73aad3ac
Example:
# wget \
http://archive.progeny.com/progeny/updates/newton/samba-common_2.0.7-3.2_i386.deb \
http://archive.progeny.com/progeny/updates/newton/samba_2.0.7-3.2_i386.deb \
http://archive.progeny.com/progeny/updates/newton/smbclient_2.0.7-3.2_i386.deb
2. Use the md5sum command on the retrieved files to verify that they
match the md5sum provided in this advisory:
Example:
# md5sum samba-common_2.0.7-3.2_i386.deb
3. Then install the replacement package(s) using the dpkg command.
Example:
# dpkg --install samba-common_2.0.7-3.2_i386.deb \
samba_2.0.7-3.2_i386.deb smbclient_2.0.7-3.2_i386.deb
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pub 1024D/F92D4D1F 2001-04-04 Progeny Security Team <securityat_private>
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This archive was generated by hypermail 2b30 : Wed Apr 18 2001 - 22:57:52 PDT