Core Security Technologies

StoneTrip S3DPlayers remote command injection

1. Advisory Information

Title: StoneTrip S3DPlayers remote command injection
Advisory Id: CORE-2009-0401
Advisory URL: http://www.coresecurity.com/content/StoneTrip-S3DPlayers
Date published: 2009-05-28
Date of last update: 2010-05-18
Vendors contacted: StoneTrip
Release mode: User release

2. Vulnerability Information

Class: OS Command Injection [CWE-78]
Impact: Code execution
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2009-1792
Bugtraq ID: 35105

3. Vulnerability Description

Ston3D is a cross-platform technology developed by StoneTrip [1], allowing applications developed with ShiVa product [2] to be run from various media. It is a platform for 3D real time development, specially designed to make games and other real time applications.

Ston3D players come in two flavors:

Ston3D StandalonePlayer,
and Ston3D WebPlayer, which runs like an extension or plug-in within most popular web browsers.

These players are vulnerable to a command injection vulnerability, which can be exploited by malicious remote attackers. The vulnerability is due to the Ston3D scripting language. It provides the function system.openURL() which does not properly sanitize the input before using it. This can be exploited to execute arbitrary commands with the privileges of the Stone3D player by opening a specially crafted file.

4. Vulnerable packages

4.1. Win32

S3DPlayer Web v1.6.0.0
S3DPlayer StandAlone v1.6.2.4
S3DPlayer StandAlone v1.7.0.1

4.2. MacOS

S3DPlayer Web v1.6.0.0
S3DPlayer StandAlone v1.6.2.4

4.3. Linux

S3DPlayer StandAlone v1.6.2.4

NOTE: Older versions are probably affected too, but they were not checked.

5. Non-vulnerable packages

The vulnerability has been fixed since 1.8 release (September 09). Please, contact StoneTrip for additional information.

6. Vendor Information, Solutions and Workarounds

The vendor did not provide this information. A possible mitigation action would be to enable MIME type filtering in your IDS/proxies and block S3DPlayer traffic:

[+ full code]

As a workaround, vulnerable users can also avoid this flaw by disabling the Ston3D Plugin in their web browsers:

6.1. Mozilla Firefox

Go to the Tools menu, and select Options...
Click on the Main tab
Click on the Manage Add-ons...
Disable Ston3D Plugin

6.2. Safari

Go to the Safari menu within Safari, and select Preferences
Click on the Security tab
Deselect Enable plug-ins

6.3. Internet Explorer

Set the kill bit for control 7508D2BB-F085-45BF-8261-167C6DF4D477 (as explained in http://support.microsoft.com/kb/240797).

Please contact StoneTrip for further information, patches and workarounds.

7. Credits

This vulnerability was discovered and researched by Diego Juarez from Core Security Technologies.

8. Technical Description / Proof of Concept Code

Ston3D is a cross-platform technology allowing applications developed with ShiVa product [2] to be run from various media, such as a website, CD/DVD or interactive equipment. This technology provides a scripting interface [3] based on the Lua programming language, within this interface the function system.openURL is defined as follows:

[+ full code]

In the current implementation, the call system.openURL(sURL, sTarget) with the parameter sURL set as file://path/command will ultimately execute the equivalent of calling

[+ full code]

By using platform specific delimiter characters this could allow arbitrary code execution in the context of the player.

Find below the relevant code snippets from various platforms.

8.1. Windows

.text:1000D64D    test    esi, esi
.text:1000D64F    mov     eax, esi
.text:1000D651    jnz     short loc_1000D658
.text:1000D653
.text:1000D653 loc_1000D653:                ; CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String const &amp;,Pandora::EngineCore::String const &amp;)+1CB
.text:1000D653    mov     eax, offset Name
.text:1000D658
.text:1000D658 loc_1000D658:                ; CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String const &amp;,Pandora::EngineCore::String const &amp;)+1D1
.text:1000D658    push    1
.text:1000D65A    push    offset Name       ; lpDirectory
.text:1000D65F    push    ecx               ; lpParameters
.text:1000D660    push    eax               ; lpFile
.text:1000D661    push    offset Operation  ; "open"
.text:1000D666    push    0                 ; hwnd
.text:1000D668    call    ds:ShellExecuteA
.text:1000D66E
.text:1000D66E loc_1000D66E:                ; CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String const &amp;,Pandora::EngineCore::String const &amp;)+1B0
.text:1000D66E    test    edi, edi
.text:1000D670    jbe     short loc_1000D67F
.text:1000D672    test    esi, esi
.text:1000D674    jz      short loc_1000D67F
.text:1000D676    add     esi, 0FFFFFFFCh
.text:1000D679    push    esi               ; Memory
.text:1000D67A    call    ebp               ; __imp_free

[+ full code]

8.2. Linux

[+ full code]

8.3. MacOSX (x86)

__text:0005995B   lea     eax, (aOpen - 597ECh)[ebx] ; "open "
__text:00059961   lea     esi, [esp+5Ch+var_44]
__text:00059965   mov     [esp+5Ch+var_58], eax
__text:00059969   mov     [esp+5Ch+var_5C], esi
__text:0005996C   call    __ZN7Pandora10EngineCore6StringC1EPKc ; Pandora::EngineCore::String::String(char  const*)
__text:00059971   mov     [esp+5Ch+var_58], edi
__text:00059975   mov     [esp+5Ch+var_5C], esi
__text:00059978   call    __ZN7Pandora10EngineCore6StringpLERKS1_
__text:0005997D   mov     edx, [esp+5Ch+var_44]
__text:00059981   test    edx, edx
__text:00059983   jz      loc_59A5F
__text:00059989   mov     eax, [esp+5Ch+var_40]
__text:0005998D   test    eax, eax
__text:0005998F   jz      loc_59A5F
__text:00059995
__text:00059995 loc_59995:                              ; CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String  const&amp;,Pandora::EngineCore::String  const&amp;)+295
__text:00059995   mov     [esp+5Ch+var_5C], eax
__text:00059998   call    _system
__text:0005999D   mov     eax, [esp+5Ch+var_44]
__text:000599A1   test    eax, eax
__text:000599A3   jnz     loc_59AB2
__text:000599A9   nop     dword ptr [eax+00000000h]

[+ full code]

8.4. MacOSX (PPC)

__text:00053D6C   addi    %r30, %sp, 0x90+var_38
__text:00053D70   addis   %r4, %r31, 0x3F
__text:00053D74   addi    %r4, %r4, -0x29DC
__text:00053D78   mr      %r3, %r30
__text:00053D7C   bl      __ZN7Pandora10EngineCore6StringC1EPKc # Pandora::EngineCore::String::String(char  const*)
__text:00053D80   mr      %r3, %r30
__text:00053D84   mr      %r4, %r29
__text:00053D88   bl      __ZN7Pandora10EngineCore6StringpLERKS1_
__text:00053D8C   lwz     %r0, 0x90+var_38(%sp)
__text:00053D90   cmpwi   cr7, %r0, 0
__text:00053D94   beq     cr7, loc_53DA4
__text:00053D98   lwz     %r3, 0x90+var_34(%sp)
__text:00053D9C   cmpwi   cr7, %r3, 0
__text:00053DA0   bc      5, 4*cr7+eq, loc_53DAC
__text:00053DA4
__text:00053DA4 loc_53DA4:                              # CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String  const&amp;,Pandora::EngineCore::String  const&amp;)+394
__text:00053DA4   addis   %rtoc, %r31, 0x3F
__text:00053DA8   addi    %r3, %rtoc, -0x5620
__text:00053DAC
__text:00053DAC loc_53DAC:                              # CODE XREF: Pandora::ClientCore::HTTPConnectionManager::OpenURL(Pandora::EngineCore::String  const&amp;,Pandora::EngineCore::String  const&amp;)+3A0
__text:00053DAC   bl      _system
__text:00053DB0   lwz     %r0, 0x90+var_38(%sp)
__text:00053DB4   cmpwi   cr7, %r0, 0
__text:00053DB8   beq     cr7, loc_53E24
__text:00053DBC   b       loc_53DF8

[+ full code]

9. Report Timeline

2009-04-20: Core Security Technologies notifies the StoneTrip team of the vulnerability and announces its initial plan to publish the content on May 18th, 2009.
2009-04-21: The vendor asks Core for a technical description of the vulnerability.
2009-04-23: Technical details sent to StoneTrip team by Core.
2009-04-24: In addition to the technical details, a Proof of Concept was sent to StoneTrip team.
2009-04-28: Core asks the vendor to confirm the reception of the technical report.
2009-04-28: StoneTrip team notifies that the technical report has been received and that a vulnerability report will be sent to Core soon.
2009-05-07: Core requests a status update for this vulnerability and notifies its plan to publish the advisory on May 18th, 2009. No reply received.
2009-05-15: Core requests an answer to the previous mail. No reply received.
2009-05-18: Core Advisories Team does not release the advisory as originally planned. Core re-schedules the advisory publication date to 26th May 2009.
2009-05-20: Core notifies StoneTrip that the advisory publication date was missed and that the last status requests were not replied. Core also notifies the vendor of the final release date (26th May 2009).
2009-05-28: After trying to contact the StoneTrip team several times without success, the advisory CORE-2009-0401 is published as 'User Release'.
2009-12-09: StoneTrip team notifies that the vulnerability has been fixed since 1.8 release (September 09).

10. References

[1] http://www.stonetrip.com.
[2] ShiVa, a platform for 3D real time development with focus in game development http://www.stonetrip.com/shiva/.
[3] http://stdn.stonetrip.com.

11. About CoreLabs

CoreLabs, the research center of Core Security Technologies, is charged with anticipating the future needs and requirements for information security technologies. We conduct our research in several important areas of computer security including system vulnerabilities, cyber attack planning and simulation, source code auditing, and cryptography. Our results include problem formalization, identification of vulnerabilities, novel solutions and prototypes for new technologies. CoreLabs regularly publishes security advisories, technical papers, project information and shared software tools for public use at: http://www.coresecurity.com/corelabs.

12. About Core Security Technologies

Core Security Technologies develops strategic solutions that help security-conscious organizations worldwide develop and maintain a proactive process for securing their networks. The company's flagship product, CORE IMPACT, is the most comprehensive product for performing enterprise security assurance testing. CORE IMPACT evaluates network, endpoint and end-user vulnerabilities and identifies what resources are exposed. It enables organizations to determine if current security investments are detecting and preventing attacks. Core Security Technologies augments its leading technology solution with world-class security consulting services, including penetration testing and software security auditing. Based in Boston, MA and Buenos Aires, Argentina, Core Security Technologies can be reached at 617-399-6980 or on the Web at http://www.coresecurity.com.

13. Disclaimer

The contents of this advisory are copyright (c) 2009 Core Security Technologies and (c) 2009 CoreLabs, and may be distributed freely provided that no fee is charged for this distribution and proper credit is given.

14. PGP/GPG Keys

This advisory has been signed with the GPG key of Core Security Technologies advisories team, which is available for download at http://www.coresecurity.com/files/attachments/core_security_advisories.asc.