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Category:   Application (Generic)  >   unarj Vendors:   Jung, Robert K.
(Red Hat Issues Fix) unarj Input Validation Bug May Let Remote Users Create Files on the Target User's System
SecurityTracker Alert ID:  1012877
SecurityTracker URL:  http://securitytracker.com/id/1012877
CVE Reference:   CVE-2004-1027   (Links to External Site)
Date:  Jan 13 2005
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.65; possibly other versions
Description:   An input validation vulnerability was reported in unarj. A remote user can create a malicious archive that, when expanded by a target user, will write arbitrary files on the target user's system.

doubles reported that a remote user can create a specially crafted archive that contains files with the '../' directory traversal characters in the path. When the target user expands the archive using the unarj 'x' command parameter, files on the target user's system may be created or potentially overwritten with the privileges of the target user.

From testing on version 2.43, it appears that files can be created using directory traversal characters but not overwritten.

Impact:   A remote user can create an archive that, when expanded by the target user, will create files on the target user's system with the privileges of the target user.

[Editor's note: It is not clear whether this flaw allows file overwriting. Some users claim so, others dispute the claim. Our testing of version 2.43 showed that only file creation was possible with that particular version.]

Solution:   Red Hat has released a fix.

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1 unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2 unarj-2.43-13.i386.rpm

ia64:
346187352a1792700194a7c7bd5de83f unarj-2.43-13.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1 unarj-2.43-13.src.rpm

ia64:
346187352a1792700194a7c7bd5de83f unarj-2.43-13.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1 unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2 unarj-2.43-13.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1 unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2 unarj-2.43-13.i386.rpm

Cause:   Access control error, Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1

Message History:   This archive entry is a follow-up to the message listed below.
Oct 11 2004 unarj Input Validation Bug May Let Remote Users Create Files on the Target User's System



 Source Message Contents

Subject:  [RHSA-2005:007-01] Updated unarj package fixes security issue


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

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated unarj package fixes security issue
Advisory ID:       RHSA-2005:007-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-007.html
Issue date:        2005-01-12
Updated on:        2005-01-12
Product:           Red Hat Enterprise Linux
CVE Names:         CAN-2004-0947 CAN-2004-1027
- ---------------------------------------------------------------------

1. Summary:

An updated unarj package that fixes a buffer overflow vulnerability and a
directory traversal vulnerability is now available.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

The unarj program is an archiving utility which can extract ARJ-compatible
archives.

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

Additionally, a path traversal vulnerability was discovered in unarj.  An
attacker could create a specially crafted archive which would create files
in the parent ("..") directory when extracted by a victim.  When used
recursively, this vulnerability could be used to overwrite critical system
files and programs.  The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2004-1027 to this issue.

Users of unarj should upgrade to this updated package which contains
backported patches and is not vulnerable to these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  Use Red Hat
Network to download and update your packages.  To launch the Red Hat
Update Agent, use the following command:

    up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

    http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

138462 - CAN-2004-0947 buffer overflow in unarj
138835 - CAN-2004-1027 unarj directory traversal issue

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1  unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2  unarj-2.43-13.i386.rpm

ia64:
346187352a1792700194a7c7bd5de83f  unarj-2.43-13.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1  unarj-2.43-13.src.rpm

ia64:
346187352a1792700194a7c7bd5de83f  unarj-2.43-13.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1  unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2  unarj-2.43-13.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/unarj-2.43-13.src.rpm
abb1c235036bd233c437b003a4dbb8c1  unarj-2.43-13.src.rpm

i386:
1b3f6e7e8780f02a7b6038b78f3af8c2  unarj-2.43-13.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2005 Red Hat, Inc.

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