Public Vulnerability Reports

MySQL MaxDB WebAgent websql logon Buffer Overflow Vulnerability



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, scalability 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.


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

The vulnerability specifically exists due to a lack of bounds checking
in the websql CGI application. In this case, the value of the password
parameter is converted to unicode and then copied to the stack. The
resulting overflow can overwrite the saved values for eip and ebp if
supplied with a 294 byte value. The stored register values are
overwritten with portions of the unicode copy of the string which may be
leveraged to execute arbitrary code with SYSTEM privileges. A simple
overwrite with a long password value will result in the following
debugger output:

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 328.0xc80]
0x00410041 in ?? ()
(gdb) bt
#0  0x00410041 in ?? ()
#1  0x00410041 in ?? ()
#2  0x00420042 in ?? ()
#3  0x00430043 in ?? ()
#4  0x00440044 in ?? ()
(gdb) i r
eax            0x0      0
ecx            0x440044 4456516
edx            0x440044 4456516
ebx            0x1a789e0        27757024
esp            0x1559490        0x1559490
ebp            0x410041 0x410041
esi            0x1a72190        27730320
edi            0x1a3d2d4        27513556
eip            0x410041 0x410041


Successful exploitation of the vulnerability can 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 listen on public facing
network interfaces.


iDEFENSE has confirmed the existence of this vulnerability in MySQL
MaxDB 7.5.00.


Employ firewalls, access control lists or other TCP/UDP restriction
mechanism to limit access to administrative systems and services.


The vulnerability has been addressed in MaxDB

Further details are available at:


The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2005-0111 to these issues. This is a candidate for inclusion
in the CVE list (, which standardizes names for
security problems.


12/22/2004   Initial vendor notification
12/27/2004   Initial vendor response
01/13/2005   Public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2004 Verisign, Inc.

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