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Category:   Application (Generic)  >   unarj Vendors:   Jung, Robert K.
(Gentoo Issues Fix) unarj Buffer Overflow in Processing Long File Names May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1012285
SecurityTracker URL:  http://securitytracker.com/id/1012285
CVE Reference:   CVE-2004-0947   (Links to External Site)
Date:  Nov 19 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): possibly 2.63a
Description:   A buffer overflow vulnerability was reported in unarj. A remote user may be able to execute arbitrary code on the target system.

Fedora reported that a remote user can create a specially crafted (long) file name that, when processed by unarj, will cause the process to crash or to execute arbitrary code.

Impact:   A remote user can create an archive that, when uncompressed by the target user, will execute arbitrary code on the target user's system.
Solution:   Gentoo has released a fix and indicates that all unarj users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unarj-2.63a-r2"

Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 11 2004 unarj Buffer Overflow in Processing Long File Names May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200411-29 ] unarj: Long filenames buffer overflow and a path


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Gentoo Linux Security Advisory                           GLSA 200411-29
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: unarj: Long filenames buffer overflow and a path traversal
            vulnerability
      Date: November 19, 2004
      Bugs: #70966
        ID: 200411-29

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Synopsis
========

unarj contains a buffer overflow and a directory traversal
vulnerability. This could lead to overwriting of arbitrary files or
the execution of arbitrary code.

Background
==========

unarj is an ARJ archive decompressor.

Affected packages
=================

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  app-arch/unarj     < 2.63a-r2                         >= 2.63a-r2

Description
===========

unarj has a bounds checking vulnerability within the handling of long
filenames in archives. It also fails to properly sanitize paths when
extracting an archive (if the "x" option is used to preserve paths).

Impact
======

An attacker could trigger a buffer overflow or a path traversal by
enticing a user to open an archive containing specially-crafted path
names, potentially resulting in the overwrite of files or execution of
arbitrary code with the permissions of the user running unarj.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All unarj users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/unarj-2.63a-r2"

References
==========

  [ 1 ] CAN-2004-0947
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0947
  [ 2 ] CAN-2004-1027
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1027

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200411-29.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.


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