full-disclosure - iDEFENSE Security Advisory 04.26.05: MySQL MaxDB Webtool Remote 'If' Stack Overflow Vulnerability

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Date: Tue Apr 26 16:11:12 2005
From: labs-no-reply at idefense.com (iDEFENSE Labs)
Subject: iDEFENSE Security Advisory 04.26.05: MySQL MaxDB
	Webtool Remote 'If' Stack Overflow Vulnerability

MySQL MaxDB Webtool Remote 'If' Stack Overflow Vulnerability

iDEFENSE Security Advisory 04.26.05
www.idefense.com/application/poi/display?id=236&type=vulnerabilities
April 26, 2005

I. BACKGROUND

MaxDB by MySQL is a re-branded and enhanced version of SAP DB, SAP AG's
open source database. MaxDB is a heavy-duty, SAP-certified open source
database that offers high availability, salability and a comprehensive
feature set. MaxDB complements the MySQL database server, targeted for
large mySAP ERP environments and other applications that require maximum
enterprise-level database functionality.

II. DESCRIPTION

Remote exploitation of a stack-based buffer overflow vulnerability in 
MySQL MaxDB could allow attackers to execute arbitrary code. 

The vulnerabiltiy specifically exists because of a lack of bounds 
checking in the WebDAV functionality of the web tool. When an attacker 
issues an HTTP request with the unlock method, along with a long "If" 
parameter string, a stack-based overflow occurs. The offending code 
follows: 

WDVH_Bool getIfHeader(sapdbwa_HttpRequestP request,
                      WDVH_Char *sIf,
                      WDVH_Int4 len)
{
WDVH_Char       *temp1, *temp2, *temp4, *temp5;
WDVH_UInt4      length;
WDVH_Char       temp3[WDVH_MAX_IF_HEADER_LEN];

if (request==NULL || sIf==NULL)
    return WDVH_False;

strcpy(sIf,"");
temp4 = (char*)sapdbwa_GetHeader(request,"If");
if (temp4 != NULL) {
    strcpy(temp3,temp4); 

The variable temp3 is a fixed-length stack buffer. The function 
sapdbwa_GetHeader() returns the user-supplied value for the "If" 
parameter. This user-supplied value is then copied into the fixed-size 
buffer using a strcpy() call. Because there is no boundary checking, it 
is possible to overflow the stack buffer and overwrite stack memory, 
ultimately leading to control of execution flow and execution of 
arbitrary code.

III. ANALYSIS

Successful exploitation of the vulnerability could allow remote 
attackers to execute code with SYSTEM privileges. Note that the 
vulnerability is in the web administration service, which should be 
configured to not allow connections from untrusted hosts or listening on

public-facing network interfaces.

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability in MySQL 
MaxDB 7.5.00.23. All versions are suspected vulnerable.

V. WORKAROUND

Filter traffic on TCP port 9999 from untrusted hosts destined for the 
MaxDB Webtool server.

VI. VENDOR RESPONSE

This vulnerability is fixed in MySQL MaxDB 7.5.00.26 which available for
download at:

   http://dev.mysql.com/downloads/maxdb/7.5.00.html

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

04/25/2005  Initial vendor notification
04/26/2005  Initial vendor response
04/26/2005  Coordinated public disclosure

IX. CREDIT

iDEFENSE Labs is credited with this discovery.

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

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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@...fense.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.