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Cisco Unified Communications Manager Multiple Vulnerabilities (VP2015-001)



Vantage Point Security Advisory 2015-001
========================================

Title: Cisco Unified Communications Manager Multiple Vulnerabilities
Vendor: Cisco
Vendor URL: http://www.cisco.com/
Versions affected:  <9.2, <10.5.2, <11.0.1.
Severity: Low to medium
Vendor notified: Yes
Reported: Oct. 2014
Public release: Aug. 13th, 2015
Author: Bernhard Mueller <bernhard[at]vantagepoint[dot]sg>

Summary:
--------

Cisco Unified Communications Manager (CUCM) offers services such as
session management, voice, video, messaging, mobility, and web
conferencing.

During the last year, Vantage Point Security has reported four
security issues to Cisco as listed below.


1. Shellshock command injection
--------------------------------

Users of CUCM can access limited functionality via the web interface
and Cisco console (SSH on port 22). Because the SSH server is
configured to process several environment variables from the client
and a vulnerable version of bash is used, it is possible to exploit
command injection via specially crafted environment variables
(CVE-2014-6271 a.k.a. shellshock). This allows an attacker to spawn a
shell running as the user "admin".


Several environment variables can be used to exploit the issue. Example:


$ LC_PAPER="() { x;};/bin/sh" ssh Administrator@xxxxxxxxxxxxxxx


2. Local File Inclusion
-----------------------

The application allows users to view the contents of any locally
accessible files on the web server through a vulnerability known as
LFI (Local File Inclusion). LFI vulnerabilities are commonly used to
download application source code, configuration files and files
containing sensitive information such as passwords.


https://cucm.example.com/:8443/reporter-servlet/GetFileContent?Location=/&FileName=/usr/local/thirdparty/jakarta-tomcat/conf/tomcat-users.xml


3. Unauthenticated access to ping command
-----------------------------------------

The pingExecute servlet allows unauthenticated users to execute pings
to arbitrary IP addresses. This could be used by an attacker to
enumerate the internal network. The following URL triggers a ping of
the host 10.0.0.1:

https://cucm.example.com:8443/cmplatform/pingExecute?hostname=10.0.0.1&interval=1.0&packetsize=12&count=1000&secure=false


4. Magic session ID allows unauthenticated access to SOAP calls
---------------------------------------------------------------

Authentication for some methods in the EPAS SOAP interface can be
bypassed by using a hardcoded session ID. The methods
"GetUserLoginInfoHandler" and "GetLoggedinXMPPUserHandler" are
affected.


Fix Information:
----------------

Upgrade to CUCM version 9.2, 10.5.2 or 11.0.1.


References:
-----------

https://tools.cisco.com/quickview/bug/CSCus88031
https://tools.cisco.com/quickview/bug/CSCur49414
https://tools.cisco.com/quickview/bug/CSCum05290
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140926-bash
http://tools.cisco.com/security/center/viewAlert.x?alertId=37111


Timeline:
---------

2014/10: Issues reported to Cisco;
2015/07: Confirm that all issues have been fixed.


About Vantage Point Security:
--------------------

Vantage Point is the leading provider for penetration testing and
security advisory services in Singapore. Clients in the Financial,
Banking and Telecommunications industries select Vantage Point
Security based on technical competency and a proven track record to
deliver significant and measurable improvements in their security
posture.

https://www.vantagepoint.sg/
office[at]vantagepoint[dot]sg