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MySQL MaxDB Webtool Remote 'If' Stack Overflow Vulnerability

04.26.05

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.

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.

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.

DETECTION

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

WORKAROUND

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

VENDOR RESPONSE

This vulnerability is fixed in MySQL MaxDB 7.5.00.30 and MySQL MaxDB
7.6.00.12 which are available for download at:

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

   http://dev.mysql.com/downloads/maxdb/7.6.00.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-1274 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

DISCLOSURE TIMELINE

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

CREDIT

iDEFENSE Labs is credited with this discovery.

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LEGAL NOTICES

Copyright © 2005 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
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There are no warranties with regard to this information. Neither the
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