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AXON PBX 2.02 DLL Hijacking

AXON PBX 2.02 DLL Hijacking
Posted May 31, 2018
Authored by Himanshu Mehta

AXON PBX version 2.02 suffers from a DLL hijacking vulnerability.

tags | exploit
systems | windows
advisories | CVE-2018-11551
MD5 | 7513907aab36270c4e33dc6b00e1d9d4

AXON PBX 2.02 DLL Hijacking

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Aloha,

*Summary:*
AXON PBX contains a DLL loading 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
'pbxsetup.exe' improperly. And it allows an attacker to load this DLL file
of the attackeras choosing that could execute arbitrary code and gain
elevated privileges without the user's knowledge.

*CVE ID: *CVE-2018-11551

*Affected Product:* AXON PBX 2.02 (pbxsetup.exe)

*Tested on:* Windows 7 (64-bit)

*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 successfully 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 (http://www.first.org/cvss/).
Base Score: 7.2 (AV:A/AC:L/Au:N/C:C/I:C/A:C)

*Proof of concept/demonstration:*

1. Create a malicious 'PROPSYS.dll' file and save it in your "Downloads"
directory.
2. Download 'pbxsetup.exe' from http://www.nch.com.au/pbx/ and save it in
your "Downloads" directory.
3. Execute pbxsetup.exe from your "Downloads" directory.
4. Malicious dll file gets executed.

*Reference:*
https://community.rapid7.com/community/infosec/blog/2010/08/23/application-dll-load-hijacking

*Credit:*
Himanshu Mehta (@lionheartroxx)

Chao!!
Himanshu Mehta

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