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Home » Hacking News » Connectiva CLA-2003:618: kernel ptrace vulnerability

Connectiva CLA-2003:618: kernel ptrace vulnerability

by Nikola Strahija on April 9th, 2003 A vulnerability has been found in one of the basic functions of the Linux operating system which allows a local attacker to execute arbitrary code which will run under root privileges.


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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : kernel
SUMMARY : Local vulnerability: ptrace
DATE : 2003-04-07 11:07:00
ID : CLA-2003:618
RELEVANT
RELEASES : 6.0, 7.0, 8

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

Alan Cox published[4] a vulnerability[1] in the linux kernel found by
Andrzej Szombierski that could be used by a local attacker to obtain
root privileges.

When a process requires a feature that a certain kernel module
provides, the kernel will spawn a child process, give it root
privileges and call /sbin/modprobe to load that module. A local
attacker can create such a process, make it request a kernel module
and wait for the child process to be spawned. Before the privilege
change, the attacker can attach to this child process and insert code
that will later be run with root privileges.

The Common Vulnerabilities and Exposures project has assigned the
name CAN-2003-0127[1] to this issue.


SOLUTION
It is recommended that all users upgrade their kernel packages.
Please note that Conectiva Linux 7.0 has two options for the kernel
upgrade, the 2.2 series and the 2.4 series.

IMPORTANT: it is not possible to use apt to apply kernel updates.
These packages have to be updated manually. Generic kernel update
instructions can be found in our updates page[2].


REFERENCES
1.http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0127
2.http://distro.conectiva.com.br/atualizacoes/
3.http://www.conectiva.com.br/suporte/pr/sistema.kernel.atualizar.html
4.http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0134.html


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/kernel-2.2.19-25U60_5cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-2.2.19-25U60_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-2.2.19-25U60_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-BOOT-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-doc-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-enterprise-2.2.19-25U60_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-smp-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-headers-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-ibcs-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-smp-2.2.19-25U60_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-smp-2.2.19-25U60_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/kernel-source-2.2.19-25U60_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/kernel-2.2.19-25U70_5cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/kernel-2.4.12-4U70_5cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/devfsd-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.2.19-25U70_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.2.19-25U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.4.12-4U70_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-2.4.12-4U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-BOOT-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-BOOT-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-doc-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-doc-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-enterprise-2.2.19-25U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-enterprise-2.4.12-4U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-headers-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-headers-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-ibcs-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.2.19-25U70_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.2.19-25U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.4.12-4U70_5cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-smp-2.4.12-4U70_5cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-source-2.2.19-25U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/kernel-source-2.4.12-4U70_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/kernel-2.4.19-1U80_13cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/devfsd-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_13cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-2.4.19-1U80_13cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-BOOT-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-doc-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-enterprise-2.4.19-1U80_13cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-headers-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-rbc-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_13cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_13cl.i586.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-smp-2.4.19-1U80_13cl.i686.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/kernel-source-2.4.19-1U80_13cl.i386.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

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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

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

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Copyright 2003 (c) Conectiva Inc.
http://www.conectiva.com

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