=====[ Tempest Security Intelligence - ADV-7/2016 ]=============================
 
  Unsafe DLL search path in Audacity 2.1.2
  
  Author: Felipe Xavier Oliveira < engfilipeoliveira89 () gmail.com >
    
  Tempest Security Intelligence - Recife, Pernambuco - Brazil

=====[ Table of Contents ]======================================================
  
1. Overview  
2. Detailed description  
3. Further attack scenarios     
4. Timeline of disclosure    
5. Thanks & Acknowledgements  
6. References

=====[ 1. Overview ]============================================================
 
* System affected  : Audacity [1].
* Software Version : 2.1.2 (other versions may also be affected).
* Impact           : A user may be infected by opening an audio file in 
                     Audacity, from an untrusted location i.e. usb flash drive, 
                     network file share.

=====[ 2. Detailed description ]================================================

Audacity version 2.1.2 is vulnerable to DLL Hijack, it tries to load 
avformat-55.dll without supplying the absolute path, thus relying upon the 
presence of such DLL on the system directory. This behavior results in an 
exploitable DLL Hijack vulnerability, even if the SafeDllSerchMode flag is 
enabled.

The vulnerability report can be found at the following URL:

http://forum.audacityteam.org/viewtopic.php?f=46&t=92698

Audacity neglected the risk associated with the vulnerability [2].

=====[ 3. Further attack scenarios ]============================================

The attacker can place a malicious dll named avformat-55.dll in the same folder 
of an Audacity project file. Upon opening the project file Audacity will load
and execute the malicious code within its proccess context. The attack may be 
carried out remotely by inducing the victim to open the project file from an 
external storage device or a network file share.

=====[ 4. Timeline of disclosure ]==============================================

08/15/2016 - Reported vulnerability.
08/15/2016 - Audacity neglected the risk.
12/11/2016 - Advisory publication date.

=====[ 5. Thanks & Acknowledgements ]===========================================

- Breno Cunha    < brenodario () gmail.com >
- Felipe Azevedo < felipe3gomes () gmail.com >
- Tempest Security Intelligence / Tempest's Pentest Team [3]

=====[ 6. References ]==========================================================

[1] http://www.audacityteam.org

[2] http://forum.audacityteam.org/viewtopic.php?f=46&t=92698

[3] http://www.tempest.com.br

=====[ EOF ]====================================================================