5738484 2000-11-16 16:47 -0700 /163 rader/ Linux Mandrake Security Team <security@LINUX-MANDRAKE.COM>
Importerad: 2000-11-17 01:01 av Brevbäraren (som är implementerad i) Python
Extern mottagare: BUGTRAQ@SECURITYFOCUS.COM
Externa svar till: security@LINUX-MANDRAKE.COM
Mottagare: Bugtraq (import) <13775>
Ärende: MDKSA-2000:071 - modutils update
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From: Linux Mandrake Security Team <security@LINUX-MANDRAKE.COM>
To: BUGTRAQ@SECURITYFOCUS.COM
Message-ID: <20001116164748.D19581@mandrakesoft.com>
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________________________________________________________________________
Linux-Mandrake Security Update Advisory
________________________________________________________________________
Package name: modutils
Date: November 16th, 2000
Advisory ID: MDKSA-2000:071
Affected versions: 7.1, 7.2
________________________________________________________________________
Problem Description:
All 2.3.x versions of modutils (since March 12 1999) contain a
vulnerability that can lead to a local root compromise. The
modprobe program uses popen() to execute the "echo" program
argumented with user input. Because popen() relies on /bin/sh to
parse the command string and execute "echo", un-escaped shell
meta-characters can be included in user input to execute commands.
Although modprobe is not installed setuid root, this vulnerability
can be exploited to gain root access provided the target system is
using kmod. Kmod is a kernel facility that automatically executes
the program modprobe when a module is requested via
request_module(). One program that can take advantage of this
vulnerability is ping. When a device is specified at the command
line that doesn't exist, request_module is called with the
user-supplied arguments passed to the kernel. The kernel then takes
the arguments and executes modprobe with them. Arbitrary commands
included in the argument for module name (device name to ping) are
then executed when popen() is called as root.
A new version of modutils (2.3.20) has been released that fixes this
particular vulnerability. modutils still supports meta expansion,
including back quoted commands, but only for data read from the
configuration file. This assumes that when modutils is run as root
out of the kernel, normal users cannot specify their own
configuration
files.
________________________________________________________________________
Please verify these md5 checksums of the updates prior to upgrading to
ensure the integrity of the downloaded package. You can do this by
running the md5sum program on the downloaded package by using
"md5sum package.rpm".
Linux-Mandrake 7.1: de9f58e8def6af9174eb53227422bb70
7.1/RPMS/modutils-2.3.20-1.2mdk.i586.rpm
05f7919a3353537fe97f0405120bb0f7
7.1/SRPMS/modutils-2.3.20-1.2mdk.src.rpm
Linux-Mandrake 7.2: 83071582ed7ae9dbe93f13a386c9f500
7.2/RPMS/modutils-2.3.20-1.1mdk.i586.rpm
a1fb2ec6a86c131a3ae2b45bca976e31
7.2/SRPMS/modutils-2.3.20-1.1mdk.src.rpm
________________________________________________________________________
To upgrade automatically, use « MandrakeUpdate ».
If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and uprade with "rpm -Fvh *.rpm".
You can download the updates directly from one of the mirror sites
listed at:
http://www.linux-mandrake.com/en/ftp.php3.
Updated packages are available in the "updates/[ver]/RPMS/"
directory. For example, if you are looking for an updated RPM
package for Linux-Mandrake 7.2, look for it in "updates/7.2/RPMS/".
Updated source RPMs are available as well, but you generally do not
need to download them.
Please be aware that sometimes it takes the mirrors a few hours to
update, so if you want an immediate upgrade, please use one of the two
above-listed mirrors.
You can view other security advisories for Linux-Mandrake at:
http://www.linux-mandrake.com/en/security/
If you want to report vulnerabilities, please contact
security@linux-mandrake.com
________________________________________________________________________
Linux-Mandrake has two security-related mailing list services that
anyone can subscribe to:
security-announce@linux-mandrake.com
Linux-Mandrake's security announcements mailing list. Only
announcements are sent to this list and it is read-only.
security-discuss@linux-mandrake.com
Linux-Mandrake's security discussion mailing list. This list is
open to anyone to discuss Linux-Mandrake security specifically and
Linux security in general.
To subscribe to either list, send a message to
sympa@linux-mandrake.com
with "subscribe [listname]" in the body of the message.
To remove yourself from either list, send a message to
sympa@linux-mandrake.com
with "unsubscribe [listname]" in the body of the message.
To get more information on either list, send a message to
sympa@linux-mandrake.com
with "info [listname]" in the body of the message.
Optionally, you can use the web interface to subscribe to or
unsubscribe from either list:
http://www.linux-mandrake.com/en/flists.php3#security
________________________________________________________________________
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security@linux-mandrake.com>
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(5738484) --------------------------------(Ombruten)