Date: Mon, 17 Jan 2005 13:29:50 +0100
From: OpenPKG <openpkg@openpkg.org.>
To: [email protected]Subject: [OpenPKG-SA-2005.002] OpenPKG Security Advisory (sudo)
Message-ID: <OpenPKG-SA-2005.002@openpkg.org.>
Reply-To: [email protected]
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.4.2.1i
Organization: The OpenPKG Project, http://www.openpkg.org/
X-Virus-Scanned: antivirus-gw at tyumen.ru
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
________________________________________________________________________
OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.htmlhttp://www.openpkg.org[email protected][email protected]
OpenPKG-SA-2005.002 17-Jan-2005
________________________________________________________________________
Package: sudo
Vulnerability: arbitrary code execution
OpenPKG Specific: no
Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= sudo-1.6.8p1-20041104 >= sudo-1.6.8p2-20041112
OpenPKG 2.2 <= sudo-1.6.8p1-2.2.1 >= sudo-1.6.8p1-2.2.2
OpenPKG 2.1 <= sudo-1.6.7p5-2.1.1 >= sudo-1.6.7p5-2.1.2
Dependent Packages: none
Description:
Liam Helmer discovered a design flaw in Sudo [0], a program used to
control user privilege escalation. The Sudo function rebuild_env()
fails to sufficiently clean potentially dangerous variables from
the environment passed to the program to be executed. An attacker
with Sudo access to a shell script that uses GNU Bash may therefore
run arbitrary commands with other (including superuser) privileges.
The Common Vulnerabilities and Exposures (CVE) project assigned the
identifier CAN-2004-1051 [1] to the problem.
Please check whether you are affected by running "<prefix>/bin/openpkg
rpm -q sudo". If you have the "sudo" package installed and its version
is affected (see above), we recommend that you immediately upgrade it
(see Solution) [2][3].
Workaround:
Add a line to the sudoers file containing the text 'Defaults
env_reset'. This causes the environment to only contain the variables
HOME, LOGNAME, PATH, SHELL, TERM, and USER, thus preventing an attack.
Solution:
Select the updated source RPM appropriate for your OpenPKG release
[4][5], fetch it from the OpenPKG FTP service [6][7] or a mirror
location, verify its integrity [8], build a corresponding binary RPM
from it [2] and update your OpenPKG installation by applying the
binary RPM [3]. For the most recent release OpenPKG 2.2, perform the
following operations to permanently fix the security problem (for
other releases adjust accordingly).
$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/2.2/UPD
ftp> get sudo-1.6.8p1-2.2.2.src.rpm
ftp> bye
$ <prefix>/bin/openpkg rpm -v --checksig sudo-1.6.8p1-2.2.2.src.rpm
$ <prefix>/bin/openpkg rpm --rebuild sudo-1.6.8p1-2.2.2.src.rpm
$ su -
# <prefix>/bin/openpkg rpm -Fvh <prefix>/RPM/PKG/sudo-1.6.8p1-2.2.2.*.rpm
________________________________________________________________________
References:
[0] http://www.sudo.ws/
[1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1051
[2] http://www.openpkg.org/tutorial.html#regular-source
[3] http://www.openpkg.org/tutorial.html#regular-binary
[4] ftp://ftp.openpkg.org/release/2.2/UPD/sudo-1.6.8p1-2.2.2.src.rpm
[5] ftp://ftp.openpkg.org/release/2.1/UPD/sudo-1.6.7p5-2.1.2.src.rpm
[6] ftp://ftp.openpkg.org/release/2.2/UPD/
[7] ftp://ftp.openpkg.org/release/2.1/UPD/
[8] http://www.openpkg.org/security.html#signature
________________________________________________________________________
For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG <openpkg@openpkg.org.>" (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org/
for details on how to verify the integrity of this advisory.
________________________________________________________________________
-----BEGIN PGP SIGNATURE-----
Comment: OpenPKG <openpkg@openpkg.org.>
iD8DBQFB66+ugHWT4GPEy58RAmbnAKD11oxrYLF/oKusAvLc7yhY606SDwCgyPFc
NlNjIk/xso2hVQ17fKfCKbA=
=kozt
-----END PGP SIGNATURE-----
