full-disclosure - Format String Vulnerability in Tripwire

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Message-ID: <20040602234116.9A3674A5B@frenchfries.net>
From: pherman at frenchfries.net (Paul Herman)
Subject: Format String Vulnerability in Tripwire

SUMMARY
-------
Tripwire(tm) is a Security, Intrusion Detection, Damage Assessment
and Recovery, Forensics software.

A vulnerability in the product allows a user on the local machine
under certain circumstances to execute arbitrary code with the
rights of the user running the program (typically root).


VERSIONS AFFECTED
-----------------
Tripwire commercial versions <= 2.4
Tripwire open source versions <= 2.3.1


DETAILS
-------
A format string vulnerability exists when tripwire generates an
email report (i.e. 'tripwire -m c -M').  Each line of the report is
passed to an fprintf() function in pipedmailmessage.cpp in the
following manner:

	fprintf(mpFile, s.c_str() );

If a local user were to create a file with a carefully crafted
filename on the local system, that filename may be included in the
report and passed to fprintf() (albeit from the heap.)  No exploit
is known at this time, but the author of this advisory believes
this vulnerability could be exploitable.

Tripwire Inc. has been notified and has implemented a fix.


IMPACT
------
This vulnerability allows an attacker to execute arbitrary code
with the rights of the user running the file check, which is
typically root. The vulnerability exists only when tripwire is used
to generate an email report.  Users who do not generate an email
report are not affected by this vulnerability.


WORKAROUND
----------
Disable email reporting.  All users are advised to upgrade to a
version which is not vulnerable.


PATCH
-----
If you are using Open Source Tripwire(tm) version 2.3.1, the
following patch will fix this particular issue:

Index: src/tripwire/pipedmailmessage.cpp
===================================================================
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- src/tripwire/pipedmailmessage.cpp   21 Jan 2001 00:46:48 -0000      1.1
+++ src/tripwire/pipedmailmessage.cpp   26 May 2004 20:59:15 -0000      1.2
@@ -180,7 +180,7 @@

 void cPipedMailMessage::SendString( const TSTRING& s )
 {
-    if( _ftprintf( mpFile, s.c_str() ) < 0 )
+    if( _ftprintf( mpFile, "%s", s.c_str() ) < 0 )
     {
         TOSTRINGSTREAM estr;
         estr << TSS_GetString( cTripwire, tripwire::STR_ERR2_MAIL_MESSAGE_COMMAND )


AUTHOR OF ADVISORY
------------------
Paul Herman <pherman@...nchfries.net>


ACKNOWLEDGEMENT
---------------
I would like to thank Robert C. Jacobson <8dgb6hw02@...akemail.com>
for an initial bug report which led to me discovering this
vulnerability.


TRIPWIRE TRADEMARK NOTICE
-------------------------
The developer of the original code and/or files is Tripwire, Inc.
Portions created by Tripwire, Inc. are copyright 2000 Tripwire,
Inc. Tripwire is a registered trademark of Tripwire, Inc.  All
rights reserved.

Nothing in the GNU General Public License or any other license to
use the code or files shall permit you to use Tripwire's
trademarks, service marks, or other intellectual property without
Tripwire's prior written consent in the form of a license agreement
signed by an officer of Tripwire, Inc.

If you have any questions, please contact Tripwire, Inc. at either
info@...pwire.org or www.tripwire.org.