BroadWin Webaccess Client – Multiple Vulnerabilities
Application: BroadWin WebAccess Client http://broadwin.com/Client.htm Versions: bwocxrun.ocx <= 1.0.0.10 (aka version 7.0) Platforms: Windows Bugs: A] format string B] arbitrary memory corruption Exploitation: remote Date: 02 Sep 2011 Author: Luigi Auriemma e-mail: aluigi@autistici.org web: aluigi.org ####################################################################### 1) Introduction 2) Bugs 3) The Code 4) Fix ####################################################################### =============== 1) Introduction =============== From vendor's website: "WebAccess is the first fully web browser-based software package for human-machine interfaces (HMI), and supervisory control and data acquisition (SCADA)." The various operations are handled by the bwocxrun.ocx ActiveX component which is available (but it's not updated) also in Advantech WebAccess (http://webaccess.advantech.com). ####################################################################### ======= 2) Bugs ======= ---------------- A] format string ---------------- The OcxSpool function is affected by a format string vulnerability caused by the usage of the Msg string provided by the attacker directly with vsprintf() without the required format argument. ------------------------------ B] arbitrary memory corruption ------------------------------ WriteTextData and CloseFile allow to corrupt arbitrary zones of the memory through a fully controllable stream identifier in fclose() and fwrite(). ####################################################################### =========== 3) The Code =========== http://aluigi.org/poc/bwocxrun_1.zip https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/17772.zip (bwocxrun_1.zip) ####################################################################### ====== 4) Fix ====== No fix. |