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Xshell5 5.0 Build 1124 DLL Hijacking

Xshell5 5.0 Build 1124 DLL Hijacking
Posted Feb 17, 2017
Authored by Nassim Asrir

Xshell5 version 5.0 build 1124 suffers from a dll hijacking vulnerability.

tags | exploit
systems | windows
SHA-256 | adc9cfccf64d4a92b0becac91603ad2491206bbe65dbe08df6868b17d64fd5f9

Xshell5 5.0 Build 1124 DLL Hijacking

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[+] Title: Xshell5 - "api-ms-win-appmodel-runtime-l1-1-0" DLL Loading Arbitrary Code Execution.
[+] Credits / Discovery: Nassim Asrir
[+] Author Email: wassline@gmail.com
[+] Author Company: Henceforth

Vendor:
===============
https://www.netsarang.com/

Product Version:
===============

5.0 Build 1124

Download:
===========

https://www.netsarang.com/xshell_download.html

About Product:
===============

Xshell is a powerful terminal emulator that supports SSH, SFTP, TELNET, RLOGIN and SERIAL. It delivers industry leading performance and feature sets that are not available in its free alternatives. Features that enterprise users will find useful include a tabbed environment, dynamic port forwarding, custom key mapping, user defined buttons, VB scripting, and UNICODE terminal for displaying 2 byte characters and international language support.

Vulnerability Type:
======================================

DLL Loading Arbitrary Code Execution.



CVE Reference:
===============
N/A


Tested on:
===============

Windows 7 - Winxp


Exploit/POC:
============
The Setup Launcher for Xshell5 is vulnerable to DLL Arbitrary Code Execution.

1) Download the DLL from: https://mega.nz/#!OYQwxJSJ!Uwaq5N1_1hWlFtPQDgCgKRF2A9kiJvF3g6FmbZ1vM7s.

2) Then copy the DLL to the Xshell5 setup directory.

3) Launch the Setup Launcher then the command "calc" execute, and DONE.

Network Access:
===============

Remote - Local



Impact:
=================

An attacker can exploit this issue by enticing a legitimate user to use the vulnerable application to open a file from a network share location that contains a specially crafted Dynamic Link Library (DLL) file.
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