bugtraq - [USN-28-1] sudo vulnerability

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Date: Wed, 17 Nov 2004 20:59:30 +0100
From: Martin Pitt <martin.pitt@...onical.com>
To: ubuntu-security-announce@...ts.ubuntu.com
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: [USN-28-1] sudo vulnerability

===========================================================
Ubuntu Security Notice USN-28-1		  November 17, 2004
sudo vulnerability
http://www.sudo.ws/sudo/alerts/bash_functions.html
===========================================================

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog)

The following packages are affected:

sudo

The problem can be corrected by upgrading the affected package to
version 1.6.7p5-1ubuntu4.1.  In general, a standard system upgrade is
sufficient to effect the necessary changes.

Details follow:

Liam Helmer discovered an input validation flaw in sudo. When the
standard shell "bash" starts up, it searches the environment for
variables with a value beginning with "()". For each of these
variables a function with the same name is created, with the function
body filled in from the environment variable's value.

A malicious user with sudo access to a shell script that uses bash can
use this feature to substitute arbitrary commands for any
non-fully-qualified programs called from the script. Therefore this
flaw can lead to privilege escalation.

  Source archives:

    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5-1ubuntu4.1.diff.gz
      Size/MD5:    19512 8732535adda58d8421cc40dfa0d4d277
    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5-1ubuntu4.1.dsc
      Size/MD5:      585 cad376439bd2828752b2ea6aca5ae8ca
    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5.orig.tar.gz
      Size/MD5:   349785 55d503e5c35bf1ea83d38244e0242aaf

  amd64 architecture (Athlon64, Opteron, EM64T Xeon)

    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5-1ubuntu4.1_amd64.deb
      Size/MD5:   155924 22253ea7307fdbab6c01e357a4dba9af

  i386 architecture (x86 compatible Intel/AMD)

    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5-1ubuntu4.1_i386.deb
      Size/MD5:   145358 4492baa2b88e8707efac77943058cc07

  powerpc architecture (Apple Macintosh G3/G4/G5)

    http://security.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.6.7p5-1ubuntu4.1_powerpc.deb
      Size/MD5:   152864 18fa79642ba2ad55923a0a5f8cb771ba

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