February 2005

ID: 00171
Ref: 154/2005
Date: 28 February 2005:14:33:31
Version: 1

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Title: Two iDEFENSE Secuirty Advisories: 1. Sun Solaris kcms_configure Arbitrary File Corruption Vulnerability 2. WU-FTPD File Globbing Denial of Service Vulnerability
Abstract:
Vendors affected: iDEFENSE
Operating systems affected: iDEFENSE
Applications affected: iDEFENSE

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Title
=====

Two iDEFENSE Secuirty Advisories:

1. Sun Solaris kcms_configure Arbitrary File Corruption Vulnerability


2. WU-FTPD File Globbing Denial of Service Vulnerability

Detail
======

1. Local exploitation of a race condition in the Kodak Color Management
System's kcms_configure script packaged with Sun Microsystems Inc.
Solaris operating system can allow for the corruption of arbitrary
files on the system.

2. Remote exploitation of an input validation vulnerability in version
2.6.2 of WU-FPTD could allow for a denial of service of the system by
resource exhaustion.



1.


Sun Solaris kcms_configure Arbitrary File Corruption Vulnerability

iDEFENSE Security Advisory 02.23.05
www.idefense.com/application/poi/display?id=206&type=vulnerabilities
February 23, 2005

I. BACKGROUND

The kcms_configure utility is part of the Kodak Color Management System
(KCMS) package that is included with Solaris. It is installed setuid
root by default.

II. DESCRIPTION


The problem specifically exists due to logging errors within kcms_configure,
a set user id (setuid) root script. The file KCS_ClogFile will be written
to if it exists in the current directory. Due to a lack of sanity checking
a local attacker can redirect log file output to an arbitrary file on the
system through the usage of symbolic links. By specifying an invalid
monitor profile argument the attacker can force an error log entry to be
written.

III. ANALYSIS

Successful exploitation allows local attackers to corrupt arbitrary files
on the system. Attackers can use this ability to append to important system
files, possibly resulting in a denial of service or local privilege elevation.

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability in Sun Solaris
versions 8 and 9. It is suspected that previous versions are also vulnerable.
It has been reported that Solaris 10 pre-release is also vulnerable.

V. WORKAROUND

Remove the setuid bit from kcms_configure:

# chmod -s /usr/openwin/bin/kcms_configure

VI. VENDOR RESPONSE

This issue is addressed in Sun Alert ID #57706 available at:

http://www.sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57706-
1

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-0481 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

04/27/2004 Initial vendor notification
04/27/2004 Initial vendor response
02/23/2005 Public disclosure

IX. CREDIT

iDEFENSE Labs is credited with this discovery.

Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp

Free tools, research and upcoming events http://labs.idefense.com

X. LEGAL NOTICES

Copyright (c) 2005 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDEFENSE. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please email
customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information.
Use of the information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this information.
Neither the author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or reliance
on, this information.



2.


WU-FTPD File Globbing Denial of Service Vulnerability

iDEFENSE Security Advisory 02.25.05
www.idefense.com/application/poi/display?id=207&type=vulnerabilities
February 25, 2005

I. BACKGROUND

WU-FTPD is an ftp daemon for Unix systems developed at Washington
University. More information is available at:

http://www.wu-ftpd.org/

II. DESCRIPTION

Remote exploitation of an input validation vulnerability in version
2.6.2 of WU-FPTD could allow for a denial of service of the system by
resource exhaustion.

The vulnerability specifically exists in the wu_fnmatch() function
in wu_fnmatch.c. When a pattern containing a '*' character is supplied as
input, the function calls itself recursively on a smaller substring. By
supplying a string which contains a large number of '*' characters, the
system will take a long time to return the results, during which time it

will be using a large amount of CPU time.

III. ANALYSIS

After a user logs into the ftpd, an attacker can send a simple command
which will cause high CPU utilization.

To exploit this vulnerability, a simple ftp client is sufficient. Once
logged in, either anonymously or as an authenticated user, issuing
the following command will cause the machine to become less responsive.

ftp> dir ***************************************************************
***************************************************************
***************************************************************
**.*

By re-connecting and issuing the command multiple times, the system can
be made completely unresponsive. This may prevent legitimate access to
services provided by the system for the period of the attack.

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability in version
2.6.2 and 2.6.1 of WU-FTPD. It is suspected that previous versions are
also affected by this vulnerability.

V. WORKAROUND
Consider disabling the ftpd. If this is not viable as an option,
consider disabling anonymous access. Disabling anonymous access will not

prevent local users from exploiting this vulnerability.

VI. VENDOR RESPONSE

No vendor response received.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned
the names CAN-2005-0256 to these issues. This is a candidate for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.

VIII. DISCLOSURE TIMELINE

02/09/2005 Initial vendor notification - No response 02/18/2005
Initial vendor notification - No response 02/25/2005 Public disclosure

IX. CREDIT

Adam Zabrocki (pi3 / pi3ki31ny) is credited with this discovery.

Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp

Free tools, research and upcoming events http://labs.idefense.com

X. LEGAL NOTICES

Copyright (c) 2005 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDEFENSE. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please email
customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.