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Message-ID: <20030328061210.2555.qmail@updates.mandrakesoft.com>
From: security at linux-mandrake.com (Mandrake Linux Security Team)
Subject: MDKSA-2003:038 - Updated 2,4 kernel packages fix ptrace vulnerability
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________________________________________________________________________
Mandrake Linux Security Update Advisory
________________________________________________________________________
Package name: kernel
Advisory ID: MDKSA-2003:038
Date: March 27th, 2003
Affected versions: 9.0, Corporate Server 2.1
________________________________________________________________________
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
________________________________________________________________________
References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0127
________________________________________________________________________
Updated Packages:
Corporate Server 2.1:
f3c1c5e6b9a677019cfe7094ff804c10 corporate/2.1/RPMS/kernel-2.4.19.32mdk-1-1mdk.i586.rpm
3dcd13d22100c30d88ddfc4294baa9e4 corporate/2.1/RPMS/kernel-BOOT-2.4.19.32mdk-1-1mdk.i586.rpm
2949fd7c641662835d2f3eb54b1fd884 corporate/2.1/RPMS/kernel-enterprise-2.4.19.32mdk-1-1mdk.i586.rpm
333689546094a5fc804ee7f5d1c4aecf corporate/2.1/RPMS/kernel-secure-2.4.19.32mdk-1-1mdk.i586.rpm
d4ad9d24d072d188afbc353cda4206b7 corporate/2.1/RPMS/kernel-smp-2.4.19.32mdk-1-1mdk.i586.rpm
4b611461a5aac876e41516948dadb710 corporate/2.1/RPMS/kernel-source-2.4.19-32mdk.i586.rpm
58f41baa7913134f719de3ae7d834ee8 corporate/2.1/SRPMS/kernel-2.4.19.32mdk-1-1mdk.src.rpm
Mandrake Linux 9.0:
f3c1c5e6b9a677019cfe7094ff804c10 9.0/RPMS/kernel-2.4.19.32mdk-1-1mdk.i586.rpm
3dcd13d22100c30d88ddfc4294baa9e4 9.0/RPMS/kernel-BOOT-2.4.19.32mdk-1-1mdk.i586.rpm
2949fd7c641662835d2f3eb54b1fd884 9.0/RPMS/kernel-enterprise-2.4.19.32mdk-1-1mdk.i586.rpm
333689546094a5fc804ee7f5d1c4aecf 9.0/RPMS/kernel-secure-2.4.19.32mdk-1-1mdk.i586.rpm
d4ad9d24d072d188afbc353cda4206b7 9.0/RPMS/kernel-smp-2.4.19.32mdk-1-1mdk.i586.rpm
4b611461a5aac876e41516948dadb710 9.0/RPMS/kernel-source-2.4.19-32mdk.i586.rpm
58f41baa7913134f719de3ae7d834ee8 9.0/SRPMS/kernel-2.4.19.32mdk-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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