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From: Kurt Seifried <seifried@SECURITYPORTAL.COM>
To: LINUX-SECURITY@LISTSERV.SECURITYPORTAL.COM
Subject: LSLID:2001051001 - Progeny - Samba - PROGENY-SA-2001-05A
Date: Thu, 10 May 2001 13:39:12 -0600
LSLID:2001051001
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PROGENY LINUX SYSTEMS -- SECURITY ADVISORY PROGENY-SA-2001-05A
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Topic: Samba /tmp vulnerabilities [update]
Category: net
Modules: samba smbclient
Announced: 2001-04-18
Credits: Marcus Meissner <Marcus.Meissner@caldera.de>
Affects: Progeny Debian (packages prior to 2.0.7-3.2progeny1)
Vendor-Status: New Version Released
(samba_2.0.7-3.2progeny1, smbclient_2.0.7-3.2progeny1)
Updated: 2001-05-08
Progeny Only: NO
$Progeny: security/advisory/PROGENY-SA-2001-05,v 1.22 2001/05/10 16:15:17
jdaily Exp $
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UPDATE
The Samba authors released version 2.0.8 of their product without
including the associated security fix. A properly-patched version of
Samba has now been released. See the SOLUTION section for upgrade
details.
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 2.0.9 and 2.2.0
correct the problem. For your convenience, we have provided the
security patch in packages smbclient_2.0.7-3.2progeny1,
samba-common_2.0.7-3.2progeny1, and samba_2.0.7-3.2progeny1.
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. Use your preferred FTP/HTTP client to retrieve the following
updated files from Progeny's update archive at:
http://archive.progeny.com/progeny/updates/newton/
MD5 Checksum Filename
- - -------------------------------- --------------------------------
728e6cdf756a2e3448e5db50010f30ac samba-common_2.0.7-3.2progeny1_i386.deb
764be493ebfcc1dda59f77155cd35cd3 samba_2.0.7-3.2progeny1_i386.deb
c722dd16aa77ca733eae10ff91a57757 smbclient_2.0.7-3.2progeny1_i386.deb
Example:
$ wget \
http://archive.progeny.com/progeny/updates/newton/samba-common_2.0.7-3.2progen
y1_i386.deb \
http://archive.progeny.com/progeny/updates/newton/samba_2.0.7-3.2progeny1_i386
.deb \
http://archive.progeny.com/progeny/updates/newton/smbclient_2.0.7-3.2progeny1_
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_2.0.7-3.2progeny1_i386.deb
3. Then install the replacement package(s) using the dpkg command.
Example:
# dpkg --install samba-common_2.0.7-3.2progeny1_i386.deb \
samba_2.0.7-3.2progeny1_i386.deb \
smbclient_2.0.7-3.2progeny1_i386.deb
WORKAROUND
No known workaround exists for this vulnerability.
---------------------------------------------------------------------------
pub 1024D/F92D4D1F 2001-04-04 Progeny Security Team <security@progeny.com>
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