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Category:   Application (Generic)  >   Midnight Commander Vendors:   Gnome Development Team
(Conectiva Issues Fix) Midnight Commander Uninitialized Buffer May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1009602
SecurityTracker URL:  http://securitytracker.com/id/1009602
CVE Reference:   CVE-2003-1023   (Links to External Site)
Date:  Mar 31 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Confirmed on 4.5.52 - 4.6.0
Description:   A vulnerability was reported in Midnight Commander. A malicious compressed archive can cause the application to execute arbitrary code.

It is reported that 'vfs/direntry.c' uses an uninitialized buffer for processing symbolic links (symlinks) in compressed archives. The flaw reportedly resides in the vfs_s_resolve_symlink() function. A remote user can create a malicious file so that when a target user processes the file using Midnight Commander, arbitrary code contained in the file will be executed with the privileges of the target user.

A demonstration exploit is provided at:

http://buggzy.narod.ru/exp.tgz

Impact:   A remote user can create an archive that, when processed by a target user, will cause arbitrary code to be executed with the privileges of the target user.
Solution:   Conectiva has released a fix.

ftp://atualizacoes.conectiva.com.br/8/RPMS/gmc-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/mc-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/mcserv-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/mc-4.5.55-6U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gmc-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/mc-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/mcserv-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/mc-4.5.55-19421U90_1cl.src.rpm

Vendor URL:  gnome.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Conectiva)
Underlying OS Comments:  8, 9

Message History:   This archive entry is a follow-up to the message listed below.
Sep 19 2003 Midnight Commander Uninitialized Buffer May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2004:833] Conectiva Security Announcement - mc


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

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : mc
SUMMARY   : Buffer overflow vulnerability
DATE      : 2004-03-31 15:03:00
ID        : CLA-2004:833
RELEVANT
RELEASES  : 8, 9

- -------------------------------------------------------------------------

DESCRIPTION
 Midnight Commander (MC) is a visual shell and a file manager for text
 consoles.
 
 This update fixes a buffer overflow vulnerability[1] in the code that
 handles symlinks in the virtual filesystem module. An attacker could
 create a specially crafted archive (like a .tar.gz or a cpio file)
 containing symlinks that when opened by an mc user would trigger the
 execution of arbitrary code with its privileges.
 
 The Common Vulnerabilities and Exposures project (cve.mitre.org) has
 assigned the name CAN-2003-1023 to this issue[2].


SOLUTION
 All users of the mc package should upgrade.
 
 
 REFERENCES
 1.http://www.securityfocus.com/bid/8658/
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-1023


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/RPMS/gmc-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/mc-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/mcserv-4.5.55-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/mc-4.5.55-6U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gmc-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/mc-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/mcserv-4.5.55-19421U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/mc-4.5.55-19421U90_1cl.src.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions regarding 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 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

- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Comment: For info see http://www.gnupg.org

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