Mandrake Linux Security Advisory : kernel (MDKSA-2003:038-1)

This script is Copyright (C) 2004-2015 Tenable Network Security, Inc.


Synopsis :

The remote Mandrake Linux host is missing one or more security
updates.

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.

See also :

http://www.securiteam.com/tools/5SP082K5GK.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
Public Exploit Available : true

Family: Mandriva Local Security Checks

Nessus Plugin ID: 14022 (mandrake_MDKSA-2003-038.nasl)

Bugtraq ID:

CVE ID: CVE-2003-0127

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