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Bitdefender Antivirus Free Edition DLL Hijacking

Bitdefender Antivirus Free Edition DLL Hijacking
Posted Jul 13, 2016
Authored by Himanshu Mehta

Bitdefender Antivirus Free Edition suffers from a DLL hijacking vulnerability.

tags | exploit
systems | windows
MD5 | 3d06d758e3d19c26207fbef8f36cc79b

Bitdefender Antivirus Free Edition DLL Hijacking

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Aloha,

*Antivirus_Free_Edition_x64**.exe* loads and executes dll from its
"application directory".

For software downloaded with a web browser the applicationdirectory is
typically the user's "Downloads" directory: see <
https://insights.sei.cmu.edu/cert/2008/09/carpet-bombing-and-directory-poisoning.html
>,
<http://blog.acrossecurity.com/2012/02/downloads-folder-binary-planting.html
>
and <http://seclists.org/fulldisclosure/2012/Aug/134> for "prior art" about
this well-known and well-documented vulnerability.


If an attacker places malicious DLL in the user's "Downloads" directory
(for example per "drive-by download" or "social engineering") this
vulnerability becomes a remote code execution.


Proof of concept/demonstration:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1. Create a malicious dll file and save it in your "Downloads" directory.

2. Download Antivirus_Free_Edition_x64.exe from
http://www.bitdefender.com/solutions/free.html
and save it in your "Downloads" directory.

3. Execute Antivirus_Free_Edition_x64.exe from your "Downloads" directory.

4. Malicious dll file gets executed.

Vendor Confirmed: Yes
Fixed Version: In Next Release.

Chao!!

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