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Mandrake Linux Security Update Advisory
________________________________________________________________________
Package name: kernel
Advisory ID: MDKSA-2003:038-1
Date: April 9th, 2003
Original Advisory Date: March 27th, 2003
Affected versions: 8.2, Multi Network Firewall 8.2
________________________________________________________________________
Problem Description:
A bug in the kernel module loader code could allow a local user to gain
root privileges. This is done by a local user using ptrace and
attaching to a modprobe process that is spawned if the user triggers
the loading of a kernel module.
A temporary workaround can be used to defend against this flaw. It is
possible to temporarily disable the kmod kernel module loading
subsystem in the kernel after all of the required kernel modules have
been loaded. Be sure that you do not need to load additional kernel
modules after implementing this workaround. To use it, as root execute:
echo /no/such/file >/proc/sys/kernel/modprobe
To automate this, you may wish to add it as the last line of the
/etc/rc.d/rc.local file. You can revert this change by replacing the
content "/sbin/modprobe" in the /proc/sys/kernel/modprobe file. The
root user can still manually load kernel modules with this workaround
in place.
This update applies a patch to correct the problem. All users should
upgrade. Please note that the Mandrake Linux 9.1 kernel already has
this patch, and an updated kernel for Mandrake Linux 8.2 will be
available shortly.
For instructions on how to upgrade your kernel in Mandrake Linux,
please refer to:
http://www.mandrakesecure.net/en/kernelupdate.php
Update:
Kernels are now available for Mandrake Linux 8.2, 8.2/PPC, and Multi-
Network Firewall 8.2.
As well, the previously noted instructions for temporarily working
around the vulnerability are not completely accurate as they only
defend against a certain type of attack making use of this problem.
Users should upgrade to the update kernels, however if you are unable
to upgrade you may wish to look into the self-compiled
no-ptrace-module.c[1] that is loaded into a running kernel.
________________________________________________________________________
References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0127
[1] http://www.securiteam.com/tools/5SP082K5GK.html
________________________________________________________________________
Updated Packages:
Mandrake Linux 8.2:
3fec7895b79c0dfc7dd917208d7b693a 8.2/RPMS/kernel-2.4.19.33mdk-1-1mdk.i586.rpm
e21014df3187220340d5bdc0131462a5 8.2/RPMS/kernel-BOOT-2.4.19.33mdk-1-1mdk.i586.rpm
c63b60b445cf0f13fefd5ac749f93f4d 8.2/RPMS/kernel-enterprise-2.4.19.33mdk-1-1mdk.i586.rpm
73c237088825424cdd319130a11096aa 8.2/RPMS/kernel-secure-2.4.19.33mdk-1-1mdk.i586.rpm
d102e5a774d0cea467df99f07705ddf2 8.2/RPMS/kernel-smp-2.4.19.33mdk-1-1mdk.i586.rpm
0c577d4ad312131885bc5dccf1d02b59 8.2/RPMS/kernel-source-2.4.19-33mdk.i586.rpm
7dd71eff7ce5b75204f0b69af354ea40 8.2/SRPMS/kernel-2.4.19.33mdk-1-1mdk.src.rpm
Mandrake Linux 8.2/PPC:
8ac23ce91ece4c7bb60b8edbc7a30626 ppc/8.2/RPMS/kernel-2.4.19.34mdk-1-1mdk.ppc.rpm
8177bc95cd70c270b78a91645bdbe79d ppc/8.2/RPMS/kernel-enterprise-2.4.19.34mdk-1-1mdk.ppc.rpm
106ecdf8f15868509ba43277288b68de ppc/8.2/RPMS/kernel-smp-2.4.19.34mdk-1-1mdk.ppc.rpm
107730358e5caa627d23360bb0fb2a02 ppc/8.2/RPMS/kernel-source-2.4.19-34mdk.ppc.rpm
22373c1175b8092fce59e0a87d072fa8 ppc/8.2/SRPMS/kernel-2.4.19.34mdk-1-1mdk.src.rpm
Multi Network Firewall 8.2:
73c237088825424cdd319130a11096aa mnf8.2/RPMS/kernel-secure-2.4.19.33mdk-1-1mdk.i586.rpm
7dd71eff7ce5b75204f0b69af354ea40 mnf8.2/SRPMS/kernel-2.4.19.33mdk-1-1mdk.src.rpm
________________________________________________________________________
Bug IDs fixed (see https://qa.mandrakesoft.com for more information):
________________________________________________________________________
To upgrade automatically, use MandrakeUpdate. The verification of md5
checksums and GPG signatures is performed automatically for you.
If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
FTP mirrors can be obtained from:
http://www.mandrakesecure.net/en/ftp.php
Please verify the update prior to upgrading to ensure the integrity of
the downloaded package. You can do this with the command:
rpm --checksig <filename>
All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team from:
https://www.mandrakesecure.net/RPM-GPG-KEYS
Please be aware that sometimes it takes the mirrors a few hours to
update.
You can view other update advisories for Mandrake Linux at:
http://www.mandrakesecure.net/en/advisories/
MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:
http://www.mandrakesecure.net/en/mlist.php
If you want to report vulnerabilities, please contact
security_linux-mandrake.com
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security linux-mandrake.com>
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