pidgin 2.11.0 DLL Hijacking Vulnerability

Daniel Atallah daniel.atallah at
Thu Jul 14 11:28:41 EDT 2016

Himanshu Meta,

This looks like it's probably a bug in the NSIS installer framework.

I suggest that you report the bug to the NSIS folks as the bug will likely
need to be fixed there before we can fix it in Pidgin (apart from switching
to a different installer framework) - it also likely affects other usage of
the common NSIS framework.


On Jul 14, 2016 8:05 AM, "Himanshu Mehta" <mehta.himanshu21 at>

> Hello,
> Please request for CVE.
> Description
> Summary pidgin contains a DLL hijacking vulnerability that could allow an
> unauthenticated, remote attacker to execute arbitrary code on the targeted
> system. The vulnerability exists due to some DLL file is loaded by
> ‘pidgin_2.11.0.exe' improperly. And it allows an attacker to load this DLL
> file of the attacker’s choosing that could execute arbitrary code without
> the user's knowledge.
> Affected Product: pidgin 2.11.0
> Impact Attacker can exploit this vulnerability to load a DLL file of the
> attacker's choosing that could execute arbitrary code. This may help
> attacker to Successful exploit the system if user creates shell as a DLL.
> Vulnerability Scoring Details The vulnerability classification has been
> performed by using the CVSSv2 scoring system (
> Base Score: 7.2 (AV:L/AC:L/Au:N/C:C/I:C/A:C)
> More Details: For software downloaded with a web browser the application
> directory is typically the user's "Downloads" directory: see
> ,
>  and 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 ntmarta.dll file and save it in your "Downloads" directory.
> 2. Download pidgin_2.11.0.exe from and save it in your "Downloads" directory.
> 3. Execute pidgin_2.11.0.exe from your "Downloads" directory.
> 4. Malicious dll file gets executed.
> Thanks & Regards,
> Himanshu Mehta
> _______________________________________________
> security mailing list
> security at
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