From idlabs-advisories@idefense.com Thu Jan 13 22:12:14 2005 From: idlabs-advisories@idefense.com To: idlabs-advisories@idefense.com Date: Thu, 13 Jan 2005 17:39:16 -0500 Reply-To: customerservice@idefense.com Subject: [Full-Disclosure] iDEFENSE Security Advisory 01.13.05: MySQL MaxDB WebAgent websql logon Buffer Overflow Vulnerability MySQL MaxDB WebAgent websql logon Buffer Overflow Vulnerability iDEFENSE Security Advisory 01.13.05 www.idefense.com/application/poi/display?id=181&type=vulnerabilities January 13, 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, 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. http://www.mysql.com/products/maxdb/ II. DESCRIPTION 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 III. ANALYSIS 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. IV. DETECTION iDEFENSE has confirmed the existence of this vulnerability in MySQL MaxDB 7.5.00. V. WORKAROUND Employ firewalls, access control lists or other TCP/UDP restriction mechanism to limit access to administrative systems and services. VI. VENDOR RESPONSE The vulnerability has been addressed in MaxDB 7.5.00.18. Further details are available at: http://www.sapdb.org/webpts?wptsdetail=yes&ErrorType=0&ErrorID=1131190 VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 12/22/2004 Initial vendor notification 12/27/2004 Initial vendor response 01/13/2005 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 X. LEGAL NOTICES Copyright (c) 2004 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@idefense.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. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html