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Category:   Application (Generic)  >   unrtf Vendors:   GNU [multiple authors]
(Gentoo Issues Fix) unrtf Buffer Overflow in process_font_table() Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1012828
SecurityTracker URL:  http://securitytracker.com/id/1012828
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 11 2005
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.19.3
Description:   A vulnerability was reported in unrtf. A remote user can cause arbitrary code to be executed by the target user.

D. J. Bernstein reported that a remote user can create a specially crafted RTF file that, when processed by the target user with unrtf, will execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

The buffer overflow resides in the process_font_table() function in 'convert.c'.

Yosef Klein and Limin Wang are credited with discovering this flaw.

Impact:   A remote user can cause arbitrary code to be executed by the target user with the privileges of the target user.
Solution:   Gentoo has issued a fix and indicates that all unrtf users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-text/unrtf-0.19.3-r1"

Vendor URL:  www.gnu.org/software/unrtf/unrtf.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Dec 16 2004 unrtf Buffer Overflow in process_font_table() Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [Full-Disclosure] [ GLSA 200501-15 ] UnRTF: Buffer overflow



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Gentoo Linux Security Advisory                           GLSA 200501-15
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: UnRTF: Buffer overflow
      Date: January 10, 2005
      Bugs: #74480
        ID: 200501-15

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Synopsis
========

A buffer overflow in UnRTF allows an attacker to execute arbitrary code
by way of a specially crafted RTF file.

Background
==========

UnRTF is a utility to convert files in the Rich Text Format into other
formats.

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

    -------------------------------------------------------------------
     Package         /   Vulnerable   /                     Unaffected
    -------------------------------------------------------------------
  1  app-text/unrtf      < 0.19.3-r1                      >= 0.19.3-r1

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

An unchecked strcat() in unrtf may overflow the bounds of a static
buffer.

Impact
======

Using a specially crafted file, possibly delivered by e-mail or over
the web, an attacker may execute arbitrary code with the permissions of
the user running UnRTF.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All unrtf users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/unrtf-0.19.3-r1"

References
==========

  [ 1 ] Original Announcement
        http://tigger.uic.edu/~jlongs2/holes/unrtf.txt

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

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

  http://security.gentoo.org/glsa/glsa-200501-15.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 2005 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.

http://creativecommons.org/licenses/by-sa/2.0


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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html

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