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Category:   Application (Generic)  >   unarj Vendors:   Jung, Robert K.
(Fedora Issues Fix for FC2) unarj Buffer Overflow in Processing Long File Names May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1012198
SecurityTracker URL:  http://securitytracker.com/id/1012198
CVE Reference:   CVE-2004-0947   (Links to External Site)
Date:  Nov 12 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.63a-7
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:   Fedora has released a fix, available at:

http://download.fedora.redhat.com/pub/fedora/linux/core/updates/2/

7cd2b05ac20893645d2d5307bec0bd44 SRPMS/unarj-2.63a-7.src.rpm
373d4ac8b936d388deeec2ef34195783 x86_64/unarj-2.63a-7.x86_64.rpm
8db05c7d97465cb809a520839799e69e x86_64/debug/unarj-
debuginfo-2.63a-7.x86_64.rpm
663a0b4cfa78c48f54ed531ed4ec5404 i386/unarj-2.63a-7.i386.rpm
dd4778dc2519de5b5dfb787a5f290ccf i386/debug/unarj-
debuginfo-2.63a-7.i386.rpm

Cause:   Boundary error
Underlying OS:  Linux (Red Hat Fedora)
Underlying OS Comments:  FC2

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:  [Security] Fedora Core 2 Update: unarj-2.63a-7


---------------------------------------------------------------------
Fedora Update Notification
FEDORA-2004-414
2004-11-11
---------------------------------------------------------------------

Product     : Fedora Core 2
Name        : unarj
Version     : 2.63a                      
Release     : 7                  
Summary     : An uncompressor for .arj format archive files.
Description :
The UNARJ program is used to uncompress .arj format archives.  The .arj
format archive was mostly used on DOS machines.

Install the unarj package if you need to uncompress .arj format
archives.

---------------------------------------------------------------------
Update Information:

A buffer overflow bug has been discovered in unarj when handling long
file names contained in an archive. An attacker could create an archive
with a specially crafted path which could cause unarj to crash or
execute arbitrary instructions.  The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2004-0947 to
this issue.

Additionally, a path traversal vulnerability exists in unarj which
allows an attacker to extract files to the parent ("..") directory. When
used recursively, this vulnerability can be used to overwrite critical
system files and programs.

Users of unarj are advised to upgrade to these packages.
---------------------------------------------------------------------
* Wed Nov 10 2004 Lon Hohberger <lhh@redhat.com> 2.63a-7

- Fix directory traversal & buffer overflow. #138468

* Tue Jun 15 2004 Elliot Lee <sopwith@redhat.com>

- rebuilt


---------------------------------------------------------------------
This update can be downloaded from:
  http://download.fedora.redhat.com/pub/fedora/linux/core/updates/2/

7cd2b05ac20893645d2d5307bec0bd44  SRPMS/unarj-2.63a-7.src.rpm
373d4ac8b936d388deeec2ef34195783  x86_64/unarj-2.63a-7.x86_64.rpm
8db05c7d97465cb809a520839799e69e  x86_64/debug/unarj-
debuginfo-2.63a-7.x86_64.rpm
663a0b4cfa78c48f54ed531ed4ec5404  i386/unarj-2.63a-7.i386.rpm
dd4778dc2519de5b5dfb787a5f290ccf  i386/debug/unarj-
debuginfo-2.63a-7.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.  
---------------------------------------------------------------------

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