Mandrake alert: Updated 2.4 kernel packages fix ptrace vulnerability

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                Mandrake Linux Security Update Advisory
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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.
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References:
  
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0127
  [1] http://www.securiteam.com/tools/5SP082K5GK.html
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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
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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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