all things security


Posted Apr 8, 2007
Authored by Piotr Bania | Site

AOL Nullsoft Winamp IT module IN_MOD.DLL suffers from a remote heap memory corruption vulnerability.

tags | advisory, remote
MD5 | a472984363a7ed6bc383af106aa1c4fd


Change Mirror Download

AOL Nullsoft Winamp IT Module "IN_MOD.DLL" Remote Heap Memory Corruption
by Piotr Bania <>

Severity: Important - Potencial remote code execution.

Software affected: Tested on AOL Nullsoft Winamp v5.33 (x86) Feb 13 2007
(on Windows XP SP1/SP2).

Orginal url:


Author takes no responsibility for any actions with provided informations or
codes. The copyright for any material created by the author is reserved. Any
duplication of codes or texts provided here in electronic or printed
publications is not permitted without the author's agreement.


AOL Nullsoft is the most popular multimedia player in the world.
in_mod.dll is a one of Winamp plugins.


The problem takes place when Winamp is trying to play specially
crafted .IT file.

IT is the proprietary module format used by Impulse Tracker, featuring
support for more advanced features than MOD or S3M before it. These include
a larger limit for lines in a pattern, higher quality samples, and other

Take a look a this code snipet:

----// SNIP SNIP //-------------------------------------------------
.text:00E97BCA write_looop: ; CODE XREF: sub_E97976+29Dj
.text:00E97BCA mov edx, [ebp+6Ch+arg_0]
.text:00E97BCD mov ecx, [ebx+18h]
.text:00E97BD0 mov dx, [eax+edx*2]
.text:00E97BD4 mov [eax+ecx*2], dx
.text:00E97BD8 mov eax, [ebx+370h]
.text:00E97BDE mov ecx, [ebx+18h]
.text:00E97BE1 mov cx, [eax+ecx*2]
.text:00E97BE5 cmp cx, [esi+6Eh]
.text:00E97BE9 jnb short loc_E97C09
.text:00E97BEB mov al, [ebx+18h]
.text:00E97BEE mov ecx, [ebp+6Ch+arg_0]
.text:00E97BF1 mov [ecx+esi+148h], al ; BANG
.text:00E97BF8 mov eax, [ebx+370h]
.text:00E97BFE cmp word ptr [eax+ecx*2], 0FEh
.text:00E97C04 jnb short loc_E97C09
.text:00E97C06 inc dword ptr [ebx+18h]
.text:00E97C09 loc_E97C09: ; CODE XREF: sub_E97976+273j
.text:00E97C09 ; sub_E97976+28Ej
.text:00E97C09 movzx ecx, word ptr [esi+68h] ; ecx=controlled value (from offset 0x20)
.text:00E97C0D inc [ebp+6Ch+arg_0]
.text:00E97C10 cmp [ebp+6Ch+arg_0], ecx
.text:00E97C13 jb short write_looop
----// SNIP SNIP //-------------------------------------------------

The memory is overwritten at 0x00E97BF1. The description of this disassembly
listing is pretty similiar to the one written in s3m module files advisory.
Due to my lazyness i will not repeat it again, whatsoever.


Successful exploitation may allow the attacker to run arbitrary code in
context of user running AOL Nullsoft Winamp.


Due to the fact i was looking for a AOL NULLSOFT contact for over 30 minutes with
no effect, i got finally bored and i haven't notified them at all.


RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

October 2017

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Oct 1st
    15 Files
  • 2
    Oct 2nd
    16 Files
  • 3
    Oct 3rd
    15 Files
  • 4
    Oct 4th
    15 Files
  • 5
    Oct 5th
    11 Files
  • 6
    Oct 6th
    6 Files
  • 7
    Oct 7th
    2 Files
  • 8
    Oct 8th
    1 Files
  • 9
    Oct 9th
    13 Files
  • 10
    Oct 10th
    16 Files
  • 11
    Oct 11th
    15 Files
  • 12
    Oct 12th
    23 Files
  • 13
    Oct 13th
    13 Files
  • 14
    Oct 14th
    12 Files
  • 15
    Oct 15th
    2 Files
  • 16
    Oct 16th
    5 Files
  • 17
    Oct 17th
    0 Files
  • 18
    Oct 18th
    0 Files
  • 19
    Oct 19th
    0 Files
  • 20
    Oct 20th
    0 Files
  • 21
    Oct 21st
    0 Files
  • 22
    Oct 22nd
    0 Files
  • 23
    Oct 23rd
    0 Files
  • 24
    Oct 24th
    0 Files
  • 25
    Oct 25th
    0 Files
  • 26
    Oct 26th
    0 Files
  • 27
    Oct 27th
    0 Files
  • 28
    Oct 28th
    0 Files
  • 29
    Oct 29th
    0 Files
  • 30
    Oct 30th
    0 Files
  • 31
    Oct 31st
    0 Files

Top Authors In Last 30 Days

File Tags


packet storm

© 2016 Packet Storm. All rights reserved.

Security Services
Hosting By