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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Conectiva Issues Fix) Linux 2.4 Kernel TCP/IP Fragment Reassembly Flaw May Let Remote Users Deny Service
SecurityTracker Alert ID:  1008432
SecurityTracker URL:  http://securitytracker.com/id/1008432
CVE Reference:   CVE-2003-0364   (Links to External Site)
Date:  Dec 10 2003
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.4
Description:   A vulnerability was reported in the Linux kernel in the processing of TCP/IP fragments. A remote user can cause denial of service conditions.

In June 2003, it was reported that a flaw in the TCP/IP fragment reassembly code may allow a remote user to send packets that will cause a large number of hash table collisions, consuming excessive CPU resources on the target system.

This vulnerability is reportedly similar to (but different from) the one reported in CVE CVE-2003-0244.

Impact:   A remote user can cause excessive CPU resources to be consume on the target system.
Solution:   Conectiva has released a fix.

ftp://atualizacoes.conectiva.com.br/8/SRPMS/kernel-2.4.19-1U80_18cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/devfsd-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-BOOT-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-doc-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-enterprise-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-headers-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-rbc-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-source-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/iptables-1.2.9-26694U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/kernel24-2.4.21-31301U90_11cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/devfsd-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/iptables-1.2.9-26694U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-BOOT-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-doc-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-headers-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-rbc-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-source-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.pentium4.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.pentium4.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.pentium4.rpm

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   State error
Underlying OS Comments:  8, 9

Message History:   This archive entry is a follow-up to the message listed below.
Dec 10 2003 Linux 2.4 Kernel TCP/IP Fragment Reassembly Flaw May Let Remote Users Deny Service



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2003:796] Conectiva Security Announcement - kernel


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : kernel
SUMMARY   : Fix for local do_brk() vulnerability
DATE      : 2003-12-05 18:00:00
ID        : CLA-2003:796
RELEVANT
RELEASES  : 8, 9

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

DESCRIPTION
 The Linux kernel is responsible for handling the basic functions of
 the GNU/Linux operating system.
 
 A vulnerability in the do_brk() function allows local attackers to
 obtain root privileges. Exploits for this vulnerability have already
 been published.
 
 Additionally, the following vulnerabilities have been fixed in a
 previous kernel release which was available on the ftp server but
 lacked an official announcement:
 
 - CAN-2003-0550[2] and CAN-2003-0551[3]: fixes for the STP protocol
 - CAN-2003-0501[4]: fix for /proc/information disclosure
 - CAN-2003-0464[5]: fix for RPC code (affects only CL9)
 - CAN-2003-0476[6]: fix for the execve system call which could allow
 local users to gain access to restricted file descriptors
 
 Specific for Conectiva Linux 8 (already fixed in a previous
 announcement for CL9[7]):
 - CAN-2003-0619[8]: fix for XDR code
 - CAN-2003-0246[9]: ioperm fix
 - CAN-2003-0248[10]: mxcsr fix
 - CAN-2003-0364[11]: TCP/IP fragments denial of service
 - CAN-2003-0244[12]: denial of service in routing table
 - CAN-2003-0247[13]: denial of service in the TTY layer
 
 Starting with this update, Conectiva Linux 9 has support for the PPTP
 protocol, which also requires an update for the iptables package.


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 9 will most likely require
 an initrd file (which is automatically created in the /boot directory
 after the new packages are installed). Generic kernel update
 instructions can be obtained in the manuals and in our updates
 page[15]. More detailed instructions are also available in Portuguese
 at our Moin[14] page.
 
 
 REFERENCES
 1.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0961
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0550
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0551
 4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0501
 5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0464
 6.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0476
 7.http://distro.conectiva.com.br/atualizacoes/index.php?id=a&anuncio=000701&idioma=en
 8.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0619
 9.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0246
 10.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0248
 11.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0364
 12.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0244
 13.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0247
 14.https://moin.conectiva.com.br/UpdatingKernelPackages
 15.http://www.conectiva.com.br/suporte/pr/sistema.kernel.atualizar.html


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/kernel-2.4.19-1U80_18cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/devfsd-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-BOOT-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-doc-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-enterprise-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-headers-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-rbc-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_18cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-source-2.4.19-1U80_18cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/iptables-1.2.9-26694U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/kernel24-2.4.21-31301U90_11cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/devfsd-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/iptables-1.2.9-26694U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-BOOT-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-doc-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-headers-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-rbc-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-source-2.4.21-31301U90_11cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.athlon.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-2.4.21-31301U90_11cl.pentium4.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-enterprise-2.4.21-31301U90_11cl.pentium4.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/kernel24-smp-2.4.21-31301U90_11cl.pentium4.rpm


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 reagarding 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) 2003 Conectiva Inc.
http://www.conectiva.com

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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