tar: directory traversal by letting tar create apropriate symlinks

Debian Bug report logs - #399845
tar: directory traversal by letting tar create apropriate symlinks

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

From: Axel Beckert <abe@deuxchevaux.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: tar: directory traversal by letting tar create apropriate symlinks

Date: Wed, 22 Nov 2006 12:48:03 +0100

Package: tar
Version: 1.16-1
Severity: critical
Tags: sarge, sid, upstream, security

There is a directory traversal bug in GNU tar as described in
http://lists.grok.org.uk/pipermail/full-disclosure/2006-November/050812.html
which means the creation and overwriting of files outside the expected
directory without using -P.

I could reproduce this security flaw in Sarge (tar 1.14-2.2) as well
in Sid (tar 1.16-1), so it probably is also in the version in Etch.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.4.33.2-1-dphys-k8-smp-64gb
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages tar depends on:
ii  libc6                        2.3.6.ds1-8 GNU C Library: Shared libraries

tar recommends no packages.

-- no debconf information

Message #10 received at 399845@bugs.debian.org (full text, mbox, reply):

From: Kees Cook <kees@outflux.net>

To: 399845@bugs.debian.org

Subject: patch

Date: Fri, 24 Nov 2006 11:35:43 -0800

Tags: patch

Hello!  I've reported this upstream[1] and suggested a possible patch[2] 
to disable handling of GNUTYPE_NAMES (since it is a deprecated type).

[1] https://savannah.gnu.org/bugs/index.php?18355
[2] https://savannah.gnu.org/bugs/download.php?file_id=11327

-- 
Kees Cook                                            @outflux.net

Message #15 received at 399845@bugs.debian.org (full text, mbox, reply):

From: Laurent Bonnaud <bonnaud@lis.inpg.fr>

To: 399845@bugs.debian.org

Subject: Re: tar: directory traversal by letting tar create apropriate symlinks

Date: Thu, 30 Nov 2006 19:51:26 +0100

Hi,

this bug is CVE-2006-6097:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6097

-- 
Laurent Bonnaud.
http://www.lis.inpg.fr/pages_perso/bonnaud/

Message #20 received at 399845-close@bugs.debian.org (full text, mbox, reply):

From: Bdale Garbee <bdale@gag.com>

To: 399845-close@bugs.debian.org

Subject: Bug#399845: fixed in tar 1.16-2

Date: Fri, 01 Dec 2006 16:47:03 +0000

Source: tar
Source-Version: 1.16-2

We believe that the bug you reported is fixed in the latest version of
tar, which is due to be installed in the Debian FTP archive:

tar_1.16-2.diff.gz
  to pool/main/t/tar/tar_1.16-2.diff.gz
tar_1.16-2.dsc
  to pool/main/t/tar/tar_1.16-2.dsc
tar_1.16-2_i386.deb
  to pool/main/t/tar/tar_1.16-2_i386.deb



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 399845@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Bdale Garbee <bdale@gag.com> (supplier of updated tar package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.7
Date: Fri,  1 Dec 2006 09:19:02 -0700
Source: tar
Binary: tar
Architecture: source i386
Version: 1.16-2
Distribution: unstable
Urgency: high
Maintainer: Bdale Garbee <bdale@gag.com>
Changed-By: Bdale Garbee <bdale@gag.com>
Description: 
 tar        - GNU tar
Closes: 399845
Changes: 
 tar (1.16-2) unstable; urgency=high
 .
   * patch from Kees Cook via upstream to disable handling of GNUTYPE_NAMES
     by default and add a new command-line switch --allow-name-mangling to
     re-enable it, as a fix for directory traversal bug (CVE-2006-6097),
     closes: #399845
Files: 
 fc5061b6d891f1daf86fd45cb8e3fd72 569 utils required tar_1.16-2.dsc
 ec350ddfa0d12e11b9f9d64dccbb552f 30534 utils required tar_1.16-2.diff.gz
 903e02f11db634f48f58cb170d43f5e1 672060 utils required tar_1.16-2_i386.deb

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