Conectiva Linux Security Announcement - bash

Dec 06, 2000, 21:13 (0 Talkback[s])

Date: Tue, 5 Dec 2000 18:16:40 -0200
From: secure@CONECTIVA.COM.BR
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [CLA-2000:350] Conectiva Linux Security Announcement - bash

CONECTIVA LINUX SECURITY ANNOUNCEMENT

PACKAGE   : bash
SUMMARY   : Insecure temporary file creation in << redirects
DATE      : 2000-12-05 18:14:00
ID        : CLA-2000:350
RELEVANT
RELEASES  : 4.0, 4.0es, 4.1, 4.2, 5.0, prg gráficos, ecommerce, 5.1, 6.0

DESCRIPTION
Bash is the default shell used in a standard Conectiva Linux installation. There is a vulnerability regarding the use of "<<" redirectors. If used, the shell creates a temporary file in /tmp with a predictable filename (the only variant is the PID). Additionally, it was not being opened exclusively. This can be used by an attacker to overwrite arbitrary files in the system. At least one initialization script (rc.sysinit) uses "<<", and it is run as root at boot time.

SOLUTION
All users should upgrade immediately.

ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform upgrades:
- 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


 - 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 can be obtained at
http://www.conectiva.com.br/contato

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Conectiva Linux Security Announcement - bash