Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the kernel package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory MDKSA-2003:038 (kernel).
A bug in the kernel module loader code could permit a local user to gain root
rights. 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
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
Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2003:038
Network Security Threat Level: High
Networks Security ID: 7112
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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