Debian Bug report logs - #496413
The possibility of attack with the help of symlinks in some Debian packages

Package: dpkg-cross; Maintainer for dpkg-cross is Debian Embedded Group <debian-embedded@lists.debian.org>; Source for dpkg-cross is src:dpkg-cross.

Reported by: "Dmitry E. Oboukhov" <dimka@uvw.ru>

Date: Sun, 24 Aug 2008 18:11:24 UTC

Severity: grave

Done: Neil Williams <codehelp@debian.org>

Bug is archived. No further changes may be made.

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Report forwarded to debian-bugs-dist@lists.debian.org, Debian Embedded Group <debian-embedded@lists.debian.org>:
Bug#496413; Package dpkg-cross. Full text and rfc822 format available.

Acknowledgement sent to "Dmitry E. Oboukhov" <dimka@uvw.ru>:
New Bug report received and forwarded. Copy sent to Debian Embedded Group <debian-embedded@lists.debian.org>. Full text and rfc822 format available.

Message #5 received at submit@bugs.debian.org (full text, mbox):

From: "Dmitry E. Oboukhov" <dimka@uvw.ru>
To: submit@bugs.debian.org
Cc: dimka@uvw.ru
Subject: The possibility of attack with the help of symlinks in some Debian packages
Date: Sun, 24 Aug 2008 22:05:29 +0400
Package: dpkg-cross
Severity: grave

Hi, maintainer!

This message about the error concerns a few packages  at  once.   I've
tested all the packages (for Lenny) on my Debian mirror.  All  scripts
of packages (marked as executable) were tested.

In some packages I've discovered scripts with errors which may be used
by a user for damaging important system files or user's files.

For example if a script uses in its work a temp file which is  created
in /tmp directory, then every user can create symlink  with  the  same
name in this directory in order to  destroy  or  rewrite  some  system
or user file.  Symlink attack may also  lead  not  only  to  the  data
desctruction but to denial of service as well.

Even if you create files or directories with help of function 'RANDOM'
or pid(), then your system is not protected. Attacker can create many
symlinks in order to destroy your data or create 'denial  of  service'
for your package scripts.

Even if you make rm(dir) for files/directories, then  your  system  is
not protected. Attacker can permanently create symlinks.

This list is created with the help of script.  This list is sorted  by
hand. Howewer in some cases mistake is possible.

Please, Be understanding to possible mistakes. :)

I set Severity into grave for this bug. The table of discovered
problems is below.

Discussion of this bug you can see in debian-devel@:
    http://lists.debian.org/debian-devel/2008/08/msg00271.html

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Reply sent to Neil Williams <codehelp@debian.org>:
You have taken responsibility. Full text and rfc822 format available.

Notification sent to "Dmitry E. Oboukhov" <dimka@uvw.ru>:
Bug acknowledged by developer. Full text and rfc822 format available.

Message #10 received at 496413-done@bugs.debian.org (full text, mbox):

From: Neil Williams <codehelp@debian.org>
To: 496413-done@bugs.debian.org
Subject: Crazy
Date: Sun, 24 Aug 2008 20:35:53 +0100
[Message part 1 (text/plain, inline)]
There is no sense in this bug - the script is installed in /usr/share/ !

It is called under specific cross-building environments within a chroot.

It is retrieved in the case of failed builds and included into bug
reports against the package that failed to cross-build (i.e. the name of
the debug log must be known to a script that is run outside the chroot).
The package itself only uses this functionality if it is specifically
patched to do so.

-- 


Neil Williams
=============
http://www.data-freedom.org/
http://www.nosoftwarepatents.com/
http://www.linux.codehelp.co.uk/


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Bug archived. Request was from Debbugs Internal Request <owner@bugs.debian.org> to internal_control@bugs.debian.org. (Mon, 22 Sep 2008 07:26:01 GMT) Full text and rfc822 format available.

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