Sony Playstation 3 (PS3) 4.31 - Save Game Preview SFO File Handling Local Command Execution

Title:
======
Sony PS3 Firmware v4.31 - Code Execution Vulnerability

Date:
=====
2013-05-12

References:
===========
http://www.vulnerability-lab.com/get_content.php?id=767

VL-ID:
=====
767

Common Vulnerability Scoring System:
====================================
6.5

Introduction:
=============
The PlayStation 3 is the third home video game console produced by Sony Computer Entertainment and the successor to the
PlayStation 2 as part of the PlayStation series. The PlayStation 3 competes with Microsoft`s Xbox 360 and Nintendo`s Wii
as part of the seventh generation of video game consoles. It was first released on November 11, 2006, in Japan, with
international markets following shortly thereafter.

Major features of the console include its unified online gaming service, the PlayStation Network, its multimedia capabilities,
connectivity with the PlayStation Portable, and its use of the Blu-ray Disc as its primary storage medium.

(Copy of the Homepage: http://en.wikipedia.org/wiki/PlayStation_3 )

PlayStation Network, often abbreviated as PSN, is an online multiplayer gaming and digital media delivery service provided/run
by Sony Computer Entertainment for use with the PlayStation 3, PlayStation Portable, and PlayStation Vita video game consoles.
The PlayStation Network is the video game portion of the Sony Entertainment Network.

(Copy of the Homepage: http://en.wikipedia.org/wiki/PlayStation_Network)

Abstract:
=========
The Vulnerability Laboratory Research Team discovered a code execution vulnerability in the official Playstation3 v4.31 Firmware.

Report-Timeline:
================
2012-10-26: Researcher Notification & Coordination
2012-11-18: Vendor Notification 1
2012-12-14: Vendor Notification 2
2012-01-18: Vendor Notification 3
2012-**-**: Vendor Response/Feedback
2012-05-01: Vendor Fix/Patch by Check
2012-05-13: Public Disclosure

Status:
========
Published

Affected Products:
==================
Sony
Product: Playstation 3 4.31

Exploitation-Technique:
=======================
Local

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

Details:
========
A local code execution vulnerability is detected in the official Playstation3 v4.31 Firmware.
The vulnerability allows local attackers to inject and execute code out of vulnerable ps3 menu main web context.

There are 3 types of save games for the sony ps3. The report is only bound to the .sfo save games of the Playstation3.
The ps3 save games sometimes use a PARAM.SFO file in the folder (USB or PS3 HD) to display movable text like marquees,
in combination with a video, sound and the (path) background picture. Normally the ps3 firmware parse the redisplayed
save game values & detail information text when processing to load it via usb/ps3-hd. The import ps3 preview filtering
can be bypassed via a splitted char by char injection of script code or system (ps3 firmware) specific commands.

The attacker syncronize his computer (to change the usb context) with USB (Save Game) and connects to the network
(USB, COMPUTER, PS3), updates the save game via computer and can execute the context directly out of the ps3 savegame preview
listing menu (SUB/HD). The exploitation requires local system access, a manipulated .sfo file, an usb device. The attacker
can only use the given byte size of the saved string (attribute values) to inject his own commands or script code.

The ps3 filter system of the SpeicherDaten (DienstProgramm) module does not recognize special chars and does not provide
any kind of input restrictions. Attackers can manipulate the .sfo file of a save game to execute system specific commands
or inject malicious persistent script code.

Successful exploitation of the vulnerability can result in persistent but local system command executions, psn session
hijacking, persistent phishing attacks, external redirect out of the vulnerable module, stable persistent save game preview
listing context manipulation.

Vulnerable Section(s):
    [+] PS Menu > Game (Spiel)

Vulnerable Module(s):
    [+] SpeicherDaten (DienstProgramm) PS3 > USB Gerät

Affected Section(s):
    [+] Title - Save Game Preview Resource (Detail Listing)

Proof of Concept:
=================
The firmware preview listing validation vulnerability can be exploited by local attackers and with low or medium required user interaction.
For demonstration or reproduce ...

The attacker needs to sync his computer (to change the usb context) with USB (Save Game) and connects to the network
(USB, COMPUTER, +PS3), updates the save game via computer and can execute the context directly out of the ps3 savegame preview
listing menu (SUB/HD). The exploitation requires local system access, a manipulated .sfo file, an usb device. The attacker
can only use the given byte size of the saved string (attribute values) to inject his own commands or script code.

The ps3 filter system of the SpeicherDaten (DienstProgramm) module does not recognize special chars and does not provide
any kind of input restrictions. Attackers can manipulate the .sfo file of a save game to execute system specific commands
or inject malicious persistent script code out of the save game preview listing.

If you inject standard frames or system unknow commands (jailbreak) without passing the filter char by char and direct sync
as update you will fail to reproduce!

PoC: PARAM.SFO

PSF

  Ä   @
                                       h         %          ,          4      
$  C    @   (  V 
      h  j 
   €   p  t    €   ð 
ACCOUNT_ID ATTRIBUTE CATEGORY DETAIL PARAMS PARAMS2 PARENTAL_LEVEL SAVEDATA_DIRECTORY SAVEDATA_LIST_PARAM SUB_TITLE TITLE   
40ac78551a88fdc   
SD 
PSHACK: Benjamin Ninja H%20'>"<[PERSISTENT INJECTED SYSTEM COMMAND OR CODE!]

Hackizeit: 1:33:07

ExpSkills: VL-LAB-TRAINING

Operation: 1%
Trojaners: 0%
... Õõ~\˜¨°¨ªA¡Á¨¦¨²;¨®ç    40ac78551a88fdc
...
BLES00371-NARUTO_STORM-0
HACKINGBKM 1
PSHACK: Benjamin Ninja H%20'>"<[PERSISTENT INJECTED SYSTEM COMMAND OR CODE!];

 

Solution:
=========
Restrict the savegame name input and disallow special chars.
Encode the savegame values and redisplaying in the menu preview of the game.
Parse the strings and values from the savegames even if included string by string via sync.

Risk:
=====
The security risk of the high exploitable but local vulnerability is estimated as critical and needs to be fixed soon.

Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri  (bkm@vulnerability-lab.com)

Disclaimer:
===========
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