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Sicherheit: Unsichere Verwendung eines Programmaufrufs in modprobe
Aktuelle Meldungen Distributionen
Name: Unsichere Verwendung eines Programmaufrufs in modprobe
ID: MDKSA-2000:071
Distribution: Mandrake
Plattformen: Mandrake 7.1, Mandrake 7.2
Datum: Fr, 17. November 2000, 12:00
Referenzen: Keine Angabe
Applikationen: modutils

Originalnachricht

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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 =AB MandrakeUpdate =BB.

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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