KJK::Hyperion ha scritto: > Since this issue is a great big rats nest, I promise a third-party patch > for it by tomorrow. Deal? And "tomorrow" turned out to be "whenever it's done". Here is it, have a temporary, third-party patch for CVE-2007-3896, by yours truly: <http://spacebunny.xepher.net/hack/shellexecutefiasco/> ---- ShellExecuteFiasco - third-party patch for CVE-2007-3896 Copyright (C) 2007 KJK::Hyperion <hackbunny@xxxxxxxxxx> <http://spacebunny.xepher.net/> ABOUT ----- This is an unofficial, third-party patch for vulnerability CVE-2007-3896 [1], intended to protect supported Microsoft operating systems until an official patch is released, and unsupported systems as well. You only need this patch if you have Internet Explorer 7 on any operating system older than Windows Vista, and only until Microsoft releases an official fix. The present patch is dramatically under-tested and it has underwent no quality assurance procedure whatsoever, so please deploy with the greatest care. It has a very good chance of misbehaving and making your system unusable; should this happen, rebooting in safe mode with command prompt might make it possible to uninstall it, or it might as well not. The patch consists of a ShellExecuteEx hook [2] that prevents the execution of malformed URLs and enforces normalization of valid URLs. Programs registering custom URL schemes might not like, support or even know about normalized URLs: this patch will interfere with any such program to the point of unusability. The normalization proper is performed by Internet Explorer's low-level internet engine, which could mangle unknown URL schemes or otherwise act unpredictably when presented with abnormal input. Notes [1] <URL:http://www.microsoft.com/technet/security/advisory/943521.mspx> [2] <URL:http://msdn2.microsoft.com/en-us/library/bb775101.aspx> INSTALLATION ------------ 1. Copy shellexecutefiasco.dll anywhere; %windir%\system32 will do. 2. Run the command: A. "regsvr32 <full path to shellexecutefiasco.dll>" or "regsvr32 /n /i:s <full path to shellexecutefiasco.dll>" to install for all users B. "regsvr32 /n /i:u <full path to shellexecutefiasco.dll>" to install for the current user only. 3. A message box will report whether the installation was successful. You need to be a privileged user to install this patch. UNINSTALLATION -------------- 1. Run the command "regsvr32 /u <full path to shellexecutefiasco.dll>". 2. A message box will report whether the uninstallation was successful. 3. Delete shellexecutefiasco.dll. You need to be a privileged user to fully uninstall this patch. LICENSE ------- The patch is released as open source under the following license: Copyright (c) 2007 KJK::Hyperion Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -- KJK:: HYPE RION
