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Neohapsis > Archives > Bugtraq> 2002-10

secure_at_conectiva.com.br
Date: Tue Oct 01 2002 - 09:52:33 CDT

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : python
SUMMARY : os.execvpe() vulnerability
DATE : 2002-10-01 11:48:00
ID : CLA-2002:527
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
Python is an interpreted, interactive, object-oriented programming
language.

Zack Weinberg found[1] a vulnerability in the way the exevpe() method
from the os.py module uses a temporary file name. A file which
supposedly should not exist is created in a unsafe way and the method
tries to execute it. The objective of such code is to discover what
error the operating system returns in a portable way.

This vulnerability affects all python versions and is fixed[2,3] in
the python CVS repository (using a better approach).

By exploiting this vulnerability a local attacker can execute
arbitrary code with the privileges of the user running python code
which uses the execvpe() method.

SOLUTION
All python users should upgrade.

REFERENCES:
1.http://mail.python.org/pipermail/python-dev/2002-August/027223.html
2.http://python.org/sf/590294
3.http://python.org/sf/601077
4.http://distro.conectiva.com.br/bugzilla/show_bug.cgi?id=6595&idioma=en

ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- 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

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribepapaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribepapaleguas.conectiva.com.br
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