Title: Acoustica Pianissimo 1.0 Build 12 (Registration ID) Buffer Overflow PoC
Advisory ID: ZSL-2015-5243
Type: Local/Remote
Impact: System Access, DoS
Risk: (4/5)
Release Date: 24.05.2015

Summary

Pianissimo virtual piano uses a combination of sample playback and advanced physical modeling to create a stunning acoustic grand piano sound. Starting with 250 MB of high quality samples of a Steinway™ Model D grand piano, Pianissimo uses complex signal processing and programming to recreate the warmth, response, and playability of a real grand piano.

Description

The vulnerability is caused due to a boundary error in the processing of a user input in the registration id field of the registration procedure, which can be exploited to cause a buffer overflow when a user inserts long array of string for the ID. Successful exploitation could allow execution of arbitrary code on the affected machine.

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(b98.1790): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files (x86)\VST\Pianissimo\Pianissimo.dll -
eax=00000000 ebx=532d0245 ecx=bdeec3ea edx=00000049 esi=4a18d43c edi=06c07739
eip=061fbda7 esp=00184a28 ebp=4d2d0276 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246
Pianissimo!CRefObj::SeekToData+0x4127:
061fbda7 8b86dc200000 mov eax,dword ptr [esi+20DCh] ds:002b:4a18f518=????????
0:000> d esp-1000
00183a28 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a38 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a48 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a58 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a68 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a78 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a88 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
00183a98 42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42 BBBBBBBBBBBBBBBB
0:000> u 061fbda7
Pianissimo!CRefObj::SeekToData+0x4127:
061fbda7 8b86dc200000 mov eax,dword ptr [esi+20DCh]
061fbdad 50 push eax
061fbdae 6a30 push 30h
061fbdb0 681cc52c06 push offset Pianissimo!CRefObj::Tell+0x45bfc (062cc51c)
061fbdb5 6810c52c06 push offset Pianissimo!CRefObj::Tell+0x45bf0 (062cc510)
061fbdba e841f8ffff call Pianissimo!CRefObj::SeekToData+0x3980 (061fb600)
061fbdbf 83c410 add esp,10h
061fbdc2 8ac3 mov al,bl

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Vendor

Acoustica, Inc. - http://www.acoustica.com

Affected Version

1.0 Build 12

Tested On

Microsoft Windows 7 Professional SP1 (EN) 32/64bit
Microsoft Windows 7 Ultimate SP1 (EN) 32/64bit

Vendor Status

N/A

PoC

pianissimo_bof.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] http://cxsecurity.com/issue/WLB-2015050151
[2] http://packetstormsecurity.com/files/132039
[3] https://www.exploit-db.com/exploits/37124/
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/103409
[5] http://www.securityfocus.com/bid/74833

Changelog

[24.05.2015] - Initial release
[25.05.2015] - Added reference [1]
[26.05.2015] - Added reference [2] and [3]
[28.05.2015] - Added reference [4]
[01.06.2015] - Added reference [5]

Contact

Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk