[Full-Disclosure] [AppSecInc Team SHATTER Security Advisory] Microsoft Windows LPC heap overflow

Type securityvulns
Reporter Securityvulns
Modified 2005-01-11T00:00:00


Microsoft Windows LPC heap overflow

AppSecInc Team SHATTER Security Advisory http://www.appsecinc.com/resources/alerts/general/07-0001.html January 10, 2005

Credit: This vulnerability was discovered and researched by Cesar Cerrudo of Application Security, Inc.

Risk Level: High

Summary: A local privilege elevation vulnerability exists on the Windows operating systems. This vulnerability allows any user to take complete control over the system and affects Windows NT, Windows 2000, Windows XP, and Windows 2003 (all service packs).

Versions Affected: Microsoft Windows NT, Windows 2000, Windows XP, and Windows 2003 (all service packs).

Details: The LPC (Local Procedure Call) mechanism is a type of interprocess communication used by the Windows operating systems. LPC is used to communicate between processes running on the same system while RPC (Remote Procedure Call) is used to communicate between processes on remote systems.

When a client process communicates with a server using LPC, the kernel fails to check that the server process has allocated enough memory before copying data sent by the client process. The native API used to connect to the LPC port is NtConnectPort. A parameter of the NtConnectPort API allows a buffer of up 260 bytes. When using this function the buffer is copied by the kernel from the client process to the server process memory ignoring the buffer size restriction which the server process set when calling NtCreatePort (the native API used to create LPC ports). This causes a heap corruption in the server process allowing arbitrary memory to be overwritten and can lead to arbitrary code execution.

Workaround: None.

Fix: http://www.microsoft.com/technet/security/bulletin/MS04-044.mspx

Application Security, Inc. www.appsecinc.com

AppSecInc is the leading provider of database security solutions for the enterprise. AppSecInc products proactively secure enterprise applications at more than 200 organizations around the world by discovering, assessing, and protecting the database against rapidly changing security threats. By securing data at its source, we enable organizations to more confidently extend their business with customers, partners and suppliers. Our security experts, combined with our strong support team, deliver up-to-date application safeguards that minimize risk and eliminate its impact on business.

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