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 kernel22 package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory MDKSA-2003:039 (kernel22).
A number of vulnerabilities have been found in the Linux 2.2 kernel that have
been addressed with the latest 2.2.25 release.
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.
As well, multiple ethernet device drivers do not pad frames with null bytes,
which could permit remote attackers to obtain information from previous packets
or kernel memory by using malformed packets.
Finally, the 2.2 kernel permits local users to cause a crash of the host system
by using the mmap() function with a PROT_READ parameter to access non-readable
memory pages through the /proc/pid/mem interface.
All users are encouraged to upgrade to the latest kernel version provided.
For instructions on how to upgrade your kernel in Mandrake Linux, please refer
Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2003:039
Network Security Threat Level: High
Networks Security ID: 6420
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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