[CLA-2004:852] Conectiva Security Announcement - kernel

From: Conectiva Updates (secure_at_conectiva.com.br)
Date: 07/28/04

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Date: Wed, 28 Jul 2004 12:46:29 -0300
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com, linsec@lists.seifried.org

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : kernel
SUMMARY : Fixes for kernel vulnerabilities
DATE : 2004-07-28 12:39:00
ID : CLA-2004:852
RELEVANT
RELEASES : 10

- -------------------------------------------------------------------------

DESCRIPTION
The Linux kernel is responsible for handling the basic functions of
the GNU/Linux operating system.

This announcement fixes the following vulnerabilities:

1. Integer overflow in netfilter's tcp_find_option function
(CAN-2004-0626[1])

Adam Osuchowski and Tomasz Dubinski noticed[2] that when using
iptables and TCP options rules, the tcp_find_option function of the
netfilter subsystem in Linux kernel 2.6 allows remote attackers to
cause a denial of service via a large option length that produces a
negative integer after a casting operation to the char type. They
also provided the corretion for this bug.

2. Missing DAC check's in inode_change_ok function
(CAN-2004-0497[3])

Missing Discretionary Access Control (DAC) checks in chown system
call allowed a local user to change the group ownership of arbitrary
files to a group that he or she belongs to, leading to a privileges
escalation vulnerability.

3. Integer overflow in ip_setsockopt function (CAN-2004-0424[4])

iSEC Security Research published[5] an integer overflow
vulnerability[4] in the ip_setsockopt function on Linux kernel 2.6.1
through 2.6.3 which allows local users to cause a denial of service
condition or execute arbitrary code via the MCAST_MSFILTER socket
option.

4. Incorrect usage of the fb_copy_cmap function in framebuffer
(CAN-2004-0229[6])

The framebuffer driver in Linux kernel 2.6.x did not properly use the
fb_copy_cmap function, possibly allowing privileges escalation for
local attackers.

5. Integer overflow in the cpufreq proc handler (CAN-2004-0228[7])

Brad Spender found an integer overflow bug in the Linux kernel
cpufreq code that allowed a local attacker to read arbitrary kernel
memory.

SOLUTION
It is recommended that all Conectiva Linux users upgrade the kernel
package.

IMPORTANT: exercise caution and preparation when upgrading the
kernel, since it will require a reboot after the new packages are
installed. In particular, Conectiva Linux 10 will most likely require
an initrd file (which is automatically created in the /boot directory
after the new packages are installed) and by default a new grub entry
will be added, not touching the old default option. Generic kernel
update instructions can be obtained in the manuals and in our
frequently asked questions page[8].

REFERENCES:
1.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0626
2.http://www.securityfocus.com/archive/1/367615/2004-06-27/2004-07-03/0
3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0497
4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0424
5.http://www.isec.pl/vulnerabilities/isec-0015-msfilter.txt
6.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0229
7.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0228
8.http://www.conectiva.com.br/suporte/pr/sistema.kernel.atualizar.html

ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions regarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com

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