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Vulnerability Assessment & Network Security Forums |
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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. Home >> Browse Vulnerability Assessment Database >> Mandrake Local Security Checks >> MDKSA-2002:041: kernel Vulnerability Assessment Details
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MDKSA-2002:041: kernel |
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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-2002:041 (kernel). A problem was discovered in the CIPE (VPN tunnel) implementation in the Linux kernel where a malformed packet could cause a crash. Andrew Griffiths discovered a vulnerability that permits remote machines to read random memory by utilizing a bug in the ICMP implementation of Linux kernels. This only affects kernels prior to 2.4.0-test6 and 2.2.18 all Mandrake Linux 2.4 kernels are not vulnerable to this problem. Another problem was discovered by the Linux Netfilter team in the IRC connection tracking component of netfilter in Linux 2.4 kernels. It consists of a very broad netmask setting which is applied to check if an IRC DCC connection through a masqueraded firewall should be permited. This would lead to unwanted ports being opened on the firewall which could possibly permit inbound connections depending on the firewall rules in use. The 2.2 and 2.4 kernels are also affected by the zlib double-free() problem as routines from the compression library are used by functions that uncompress filesystems loaded into ramdisks and other occassions that are not security-critical. The kernel also uses the compression library in the PPP layer as well as the freeswan IPSec kernel module. As well, a number of other non-security fixes are present in these kernels, including new and enhanced drivers, LSB compliance, and more. MandrakeSoft encourages all users to upgrade their kernel as soon as possible to these new 2.2 and 2.4 kernels. NOTE: This update cannot be accomplished via MandrakeUpdate it must be done on the console. This prevents one from upgrading a kernel instead of installing a new kernel. To upgrade, please ensure that you have first upgraded iptables, mkinitrd, and initscripts packages if they are applicable to your platform. Use 'rpm -ivh kernel_package' to install the new kernel. Prior to rebooting, double-check your /etc/lilo.conf, /boot/grub/menu.lst, or /etc/yaboot.conf (PPC users only) to ensure that you are able to boot properly into both old and new kernels (this will permit you to boot into the old kernel if the new kernel does not work to your liking). LILO users should execute '/sbin/lilo -v', GRUB users should execute 'sh /boot/grun/install.sh', and PPC users must type '/sbin/ybin -v' to write the boot record in order to reboot into the new kernel if you made any changes to the respective boot configuration files. New kernels for Mandrake Linux 8.1/IA64 will be available shortly. Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2002:041 Network Security Threat Level: High Networks Security ID: Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security |
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