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Airscanner Mobile Security Advisory #05081101: vxWeb v.1.1.4 Denial of Service Vulnerability
From: contact () airscanner com
Date: 15 Sep 2005 00:44:59 -0000
Airscanner Mobile Security Advisory #05081101:
vxWeb v.1.1.4 Denial of Service Vulnerability
Tested on Windows Mobile Pocket PC 2003
Mobile device running Windows Mobile Pocket PC with vxWeb v1.1.4 installed and running.
Airscanner Mobile Security
Mobile Antivirus Researchers Association
August 11 2005
vxWeb is a complete multi-threaded web server for Windows CE-based devices. However, it is vulnerable to a stack based
buffer overflow that results in an instant crash of the web server.
.text:0001C310 BL __2_YAPAXI_Z ; operator new(uint)
The YAPAXI or set(UINT) command (located in coredll.dll) ends up reading data off the stack which can be overwritten by
a long request. As a result, code in coredll.dll will be fed invalid datatypes, an exception will be thrown, and the
web server will crash. We were not able to get code into the program counter (PC). We were able to manually insert
values that permitted the yapaxi function to continue on, but this did not result in any other interesting results.
Copyright (c) 2005 Airscanner Corp.
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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 of the information constitutes acceptance for use on 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.
- Airscanner Mobile Security Advisory #05081101: vxWeb v.1.1.4 Denial of Service Vulnerability contact (Sep 15)