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MyServer 'cgi-lib.dll' Buffer Overflow Permits Remote Code Execution
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SecurityTracker Alert ID: 1007693 |
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SecurityTracker URL: http://securitytracker.com/id/1007693
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Sep 13 2003
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Impact:
Execution of arbitrary code via network, User access via network
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Exploit Included: Yes
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Version(s): 0.4.3 and prior versions
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Description:
A buffer overflow vulnerability was reported in MyServer. A remote user can execute arbitrary code with the privileges of the target MyServer process.
Moozatech reported that the 'cgi-lib.dll' MSCGI library does not properly process long URL variables. A remote user can reportedly submit a specially crafted HTTP request to trigger a buffer overflow and execute arbitrary code.
A demonstration exploit request is provided:
GET /cgi-bin/math_sum.mscgi?a=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.1
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Impact:
A remote user can execute arbitrary code with the privileges of the MyServer process.
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Solution:
The vendor has released a fix, available via CVS at:
http://myserverweb.sourceforge.net/cvs.php
A patch is reportedly planned for the next release of the software.
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Vendor URL: myserverweb.sourceforge.net/forum/portal.php (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Fri, 12 Sep 2003 06:58:29 -0700
Subject: Moozatech: MyServer Buffer Overflow vulnerability
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------=_NextPart_000_0004_01C378FB.45718DA0
Content-Type: text/plain;
charset="windows-1255"
Content-Transfer-Encoding: 8bit
12/09/03
Moozatech Advisory http://www.moozatech.com/mt-12-09-2003.txt
-------------------------------------------------------
Application: MyServer Web Server
Web Site: http://myserverweb.sf.net
Versions: 0.4.3 and below
Platform: Windows98,Windows2000,Linux
Bug: Buffer Overflow.
Risk: Remote DOS and unauthorized remote access.
Severity: High
Fix Available: Yes
-------------------------------------------------------
1) Introduction
2) Bug
3) The Code
4) Fix
5) About Moozatech
===============
1) Introduction
===============
MyServer is a free, powerful web server program designed to be easily run on
a personal
Computer by the average computer user.
It is a multithread application and supports HTTP, CGI, ISAPI, WinCGI and
FastCGI protocols.
======
2) Bug
======
a buffer overflow might allow Remote attacker to invoke malicious code by
submitting a request containing excessive data.
That will cause a buffer overflow and might allow to run code of choice
Under the web server privileges.
The problem is in the MSCGI library (cgi-lib.dll) that doesn’t handle
correctly long
String values for the URI variables.
====================
3) Proof of concept.
====================
nc.exe -v www.victim.com < request.txt
--
The script is attached.
This will crash the program with a memory overflow.
======
4) Fix
======
The author has confirmed this bug and temporary fix is available through
MyServer cvs repository at:
http://myserverweb.sourceforge.net/cvs.php
Complete patch will be available in the next upcoming release of myserver.
==================
5) About Moozatech
==================
Moozatech IT Systems Ltd. (“Moozatech”) is a leading information security
consulting
and project management firm focused on developing
"Secure IT Solutions" which best suit the client's operational needs.
Moozatech devotes time to make a secure computing environment for customers.
-----
Moran Zavdi
Moozatech IT Systems
www.moozatech.com
------=_NextPart_000_0004_01C378FB.45718DA0
Content-Type: text/plain;
name="mt-12-09-2003.txt"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
filename="mt-12-09-2003.txt"
12/09/03
Moozatech Advisory http://www.moozatech.com/mt-12-09-2003.txt =09
-------------------------------------------------------
Application: MyServer Web Server
Web Site: http://myserverweb.sf.net
Versions: 0.4.3
Platform: Windows98,Windows2000,Linux
Bug: Buffer Overflow.
Risk: Remote DOS and unauthorized remote access.
Severity: High
Fix Available: Yes
-------------------------------------------------------
1) Introduction
2) Bug
3) The Code
4) Fix
5) About Moozatech
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
1) Introduction
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
MyServer is a free, powerful web server program designed to be easily =
run on a personal=20
Computer by the average computer user.=20
It is a multithread application and supports HTTP, CGI, ISAPI, WinCGI =
and FastCGI protocols.=20
=3D=3D=3D=3D=3D=3D
2) Bug
=3D=3D=3D=3D=3D=3D
a buffer overflow might allow Remote attacker to invoke malicious code =
by submitting a request containing excessive data.=20
That will cause a buffer overflow and might allow to run code of choice =
Under the web server privileges.
The problem is in the MSCGI library (cgi-lib.dll) that doesn=92t handle =
correctly long=20
String values for the URI variables.=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3) Proof of concept.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
nc.exe -v www.victim.com < request.txt
=20
--
The script is attached.
This will crash the program with a memory overflow.
=3D=3D=3D=3D=3D=3D
4) Fix
=3D=3D=3D=3D=3D=3D
The author has confirmed this bug and temporary fix is available through =
MyServer cvs repository at:
http://myserverweb.sourceforge.net/cvs.php
Complete patch will be available in the next upcoming release of =
myserver.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
5) About Moozatech
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Moozatech IT Systems Ltd. (=93Moozatech=94) is a leading information =
security consulting=20
and project management firm focused on developing=20
"Secure IT Solutions" which best suit the client's operational needs.=20
Moozatech devotes time to make a secure computing environment for =
customers.
------=_NextPart_000_0004_01C378FB.45718DA0
Content-Type: text/plain;
name="request.txt"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
filename="request.txt"
GET =
/cgi-bin/math_sum.mscgi?a=3DAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Moozatech (compatible; Moozatech Scanner)
Host: 12.12.12.12
Connection: Keep-Alive
------=_NextPart_000_0004_01C378FB.45718DA0--
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