Subject: iDEFENSE Security Advisory 04.25.05: MySQL MaxDB Webtool Remote Lock-Token Stack Overflow Vulnerability
Date: Mon, 25 Apr 2005 18:21:25 -0400
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Thread-Topic: iDEFENSE Security Advisory 04.25.05: MySQL MaxDB Webtool Remote Lock-Token Stack Overflow Vulnerability
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From: "iDEFENSE Labs" <labs-no-reply@idefense.com.>
To: <bugtraq@securityfocus.com.>, <vulnwatch@vulnwatch.org.>,
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MySQL MaxDB Webtool Remote Lock-Token Stack Overflow Vulnerability=20
iDEFENSE Security Advisory 04.25.05
www.idefense.com/application/poi/display?id=3D235&type=3Dvulnerabilities
April 25, 2005
I. BACKGROUND
MaxDB by MySQL is a re-branded and enhanced version of SAP DB, SAP AG's=20
open source database. MaxDB is a heavy-duty, SAP-certified open source=20
database that offers high availability, scalability and a comprehensive=20
feature set. MaxDB complements the MySQL database server, targeted for=20
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=20
MySQL MaxDB could allow attackers to execute arbitrary code.=20
The vulnerability specifically exists due to a lack of bounds checking=20
in the WebDAV functionality of the web tool. When an attacker issues an=20
HTTP request with the unlock method, along with a long Lock-Token=20
string, a stack-based overflow occurs. The offending code follows:=20
MaxDB_ORG/sys/src/SAPDB/WebDAV/Handler/WDVHandler_CommonUtils.c:
WDVH_Bool getLockTokenHeader(sapdbwa_HttpRequestP request,
WDVH_Char *sLockToken,
WDVH_Char *errormsg)=20
{
WDVH_Char *temp1, *temp2, *temp4, *temp5;
WDVH_UInt4 length;
WDVH_Char temp3[WDVH_MAX_IF_HEADER_LEN];
if (request=3D=3DNULL || sLockToken=3D=3DNULL || errormsg=3D=3DNULL)
return WDVH_False;
temp4 =3D (char*)sapdbwa_GetHeader(request,"Lock-Token");
if (temp4 !=3D NULL) {
strcpy(temp3,temp4);
[...]=20
The variable temp3 is a fixed-length stack buffer. The function=20
sapdbwa_GetHeader() returns the user supplied value for Lock-Token. This
user-supplied value is then copied into the fixed-size buffer using a=20
strcpy() call. Due to no boundary checking, it is possible to overflow=20
the stack buffer and overwrite stack memory, ultimately leading to=20
control of execution flow and execution of arbitrary code.
III. ANALYSIS
Successful exploitation of the vulnerability can allow remote attackers=20
to execute code with SYSTEM privileges. Note that the vulnerability is=20
in the web administration service, which should be configured to not=20
allow connections from untrusted hosts or listening on public-facing=20
network interfaces.
IV. DETECTION
iDEFENSE has confirmed the existence of this vulnerability in MySQL=20
MaxDB 7.5.00.23.
V. WORKAROUND
Employ firewalls, access control lists or other TCP/UDP-restriction=20
mechanisms to limit access to administrative systems and services.
VI. VENDOR RESPONSE
This vulnerability is addressed in MySQL MaxDB 7.5.00.26 available for
download at:
http://dev.mysql.com/downloads/maxdb/7.5.00.html
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-0684 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems. This is one of two vulnerabilities that have been
assigned CAN-2005-0684.
VIII. DISCLOSURE TIMELINE
03/08/2005 Initial vendor notification
03/11/2005 Initial vendor response
04/25/2005 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
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 [email protected] 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.
