bugtraq - AbsoluteTelnet 10.14 DLL Hijack Code Exec

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Date: Mon, 21 Mar 2016 02:31:03 GMT
From: hyp3rlinx@...os.com
To: bugtraq@...urityfocus.com
Subject: AbsoluteTelnet 10.14 DLL Hijack Code Exec

[+] Credits: hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/ABSOLUTETELNET-DLL-HIJACK.txt

Vendor:
==========================
www.celestialsoftware.net

Product:
=====================
AbsoluteTelnet 10.14

AbsoluteTelnet / SSH is a telnet and SSH client with SFTP file transfer for Windows.

Vulnerability Type:
=========================
DLL Hijack Code Execution

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

Vulnerability Details:
=====================

AbsoluteTelnet will execute arbitrary code via DLL "stauto32.dll" from CWD or if placed in certain locations... e.g. Desktop etc...

When AbsoluteTelnet installs it creates a shortcut in the start list under start run with an empty "Start" field under the properties for the shortcut.
If a user drags this shortcut to desktop or creates a new one, and DLL named "stauto32.dll" exists in this case on desktop. The DLL will be executed when
AbsoluteTelnet is run. Other scenarios may include connecting to or opening documents from a network share where an attacker has compromised that share.

Reference:
http://www.celestialsoftware.net/absolutetelnet-ssh-client/absolutetelnet/ssh-version-history-9.53.html

Users should upgrade to version 10.15

POC steps...

1- create malicious DLL "stauto32.dll" place in Desktop
2- run vulnerable AbsoluteTelnet version from shortcut sent to desktop
3- arbitrary DLL code executed

Disclosure Timeline:
=====================================
Vendor Notification:  Feb 23, 2016
Vendor confirms vulnerability
Vendor releases fixed version 10.15
March 20, 2016  : Public Disclosure

Severity Level:
================
High

[+] Disclaimer
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author.
The author is not responsible for any misuse of the information contained herein and prohibits any malicious use of all security related information or exploits by the author or elsewhere. 

hyp3rlinx