From: Progeny Security Team <security@progeny.com>
To: progeny-security-announce@lists.progeny.com,
progeny-debian@lists.progeny.com, bugtraq@securityfocus.com,
linuxlist@securityportal.com
Subject: PROGENY-SA-2001-24: Tempfile problem in OpenSSH
Date: Tue, 14 Aug 2001 16:23:52 -0500 (EST)
Cc: Progeny Security Team <security@progeny.com>
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PROGENY SERVICE NETWORK -- SECURITY ADVISORY PROGENY-SA-2001-24
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Synopsis: Tempfile problem in OpenSSH
Software: ssh
History:
2001-06-04 Vulnerability announced
2001-08-14 Update available in Progeny archive
Credits: zen-parse <zen-parse@gmx.net>
Affects: Progeny Debian (ssh prior to 2.9p2-4.0progeny1)
Progeny Only: NO
Vendor-Status: New Version Released
(ssh_2.9p2-4.0progeny1)
$Progeny: security/advisory/PROGENY-SA-2001-24,v 1.6 2001/08/14 20:03:19 dsp Exp $
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SUMMARY
Due to a problem with the handling of temporary files by the ssh package,
a local user could remove any file called "cookies" on the system if X11
forwarding is enabled in the ssh configuration file.
X11 forwarding is disabled by default in Progeny Debian.
SOLUTION (See also: UPDATING VIA APT-GET)
Upgrade to a fixed version of ssh. Version 2.9p2-4.0progeny1
corrects the problem. For your convenience, you may upgrade to the
ssh_2.9p2-4.0progeny1 package.
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 ssh
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
-------------------------------- -------------------------------------
bcbf5b7d79115d1d4e974bed95391bbc ssh_2.9p2-4.0progeny1_i386.deb
fb0eec3d5916d61e65d04d7e3975c36c ssh-askpass-gnome_2.9p2-4.0progeny1_i386.deb
Example:
$ wget \
http://archive.progeny.com/progeny/updates/newton/ssh_2.9p2-4.0progeny1_i386.deb
2. Use the md5sum(1) command on the retrieved files to verify that
they match the MD5 checksum provided in this advisory:
Example:
$ md5sum ssh_2.9p2-4.0progeny1_i386.deb
3. Then install the replacement package(s) using dpkg(8).
Example:
# dpkg --install ssh_2.9p2-4.0progeny1_i386.deb
WORKAROUND
As an alternative to the above solution, one may make sure
"X11Forwarding no" appears in the /etc/ssh/sshd_config file.
MORE INFORMATION
This bug was originally documented in a post to the BUGTRAQ mailing
list, available at http://www.securityfocus.com/archive/1/188450
Progeny advisories can be found at http://www.progeny.com/security/.
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pub 1024D/F92D4D1F 2001-04-04 Progeny Security Team <security@progeny.com>
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