iDefense Security Advisory 08.21.07: Trend Micro ServerProtect RPCFN_SYNC_TASK Integer Overflow Vulnerability

Trend Micro ServerProtect RPCFN_SYNC_TASK Integer Overflow Vulnerability

iDefense Security Advisory 08.21.07
http://labs.idefense.com/intelligence/vulnerabilities/ Aug 21, 2007

I. BACKGROUND Trend Micro Inc.'s ServerProtect is an anti-virus software for Microsoft Windows and Novell NetWare servers. It enables network administrators to manage multiple deployments from a single management console. For more information, please visit vendor's website at the following URL.

http://us.trendmicro.com/us/products/enterprise/serverprotect-for-microsoft-windows/index.html

II. DESCRIPTION Remote exploitation of an integer overflow vulnerability in Trend Micro Inc.'s ServerProtect anti-virus software could allow attackers to execute arbitrary code with system level privilege.

The Trend ServerProtect service (SpntSvc.exe) handles RPC requests on TCP port 5168 with interface uuid 25288888-bd5b-11d1-9d53-0080c83a5c2c. This service utilizes the StRpcSrv.dll library to service various RPC requests.

An integer overflow exists wtihin the RPCFN_SYNC_TASK function. This function allocates memory based on a user-supplied integer within the request data. By specifying a value that causes an integer overflow during arithmetic calculations, an attacker can cause too little memory to be allocated. User-supplied data is then copied into the resulting buffer using lstrcpyW. This results in an exploitable heap buffer overflow.

III. ANALYSIS Exploitation allows attackers to execute arbitrary code with system level privilege.

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Exploitation requires that attackers send specially crafted RPC requests to the Trend ServerProtect or Trend ServerProtect Agent services.

IV. DETECTION iDefense has confirmed the existence of this vulnerability in ServerProtect for Windows 5.58 Build 1176 (Security Patch 3). Previous versions, as well as versions for other platforms, are suspected to be vulnerable.

V. WORKAROUND iDefense is currently unaware of any workarounds for this issue.

VI. VENDOR RESPONSE Trend Micro has addressed these vulnerabilities with the release of Security Patch 4 for ServerProtect. For more information consult the release notes at the following URL.

http://www.trendmicro.com/ftp/documentation/readme/spnt_558_win_en_securitypatch4_readme.txt

VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-4219 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE

06/14/2007  Initial vendor notification
06/20/2007  Initial vendor response
08/21/2007  Coordinated public disclosure

IX. CREDIT This vulnerability was discovered by Jun Mao (iDefense Labs).

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X. LEGAL NOTICES Copyright © 2007 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 e-mail 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. Received on Tue Aug 21 19:28:17 2007