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             AUSCERT External Security Bulletin Redistribution

     Cisco WebEx Meetings Server Information Disclosure Vulnerability
                                11 May 2017


        AusCERT Security Bulletin Summary

Product:           Cisco WebEx Meetings Server
Publisher:         Cisco Systems
Operating System:  Cisco
                   VMware ESX Server
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6651  

Original Bulletin: 

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Cisco WebEx Meetings Server Information Disclosure Vulnerability


Advisory ID:


First Published:

2017 May 10 16:00 GMT

Version 1.0:




Cisco Bug IDs:


CVSS Score:

Base 7.5, Temporal 7.5




A vulnerability in Cisco WebEx Meetings Server could allow unauthenticated, 
remote attackers to gain information that could allow them to access scheduled
customer meetings.

The vulnerability is due to an incomplete configuration of the robots.txt file
on customer-hosted WebEx solutions and occurs when the Short URL functionality
is not activated. All releases of Cisco WebEx Meetings Server later than 
release 2.5MR4 provide this functionality.

An attacker could exploit this vulnerability via an exposed parameter to 
search for indexed meeting information. A successful exploit could allow the 
attacker to obtain scheduled meeting information and potentially allow the 
attacker to attend scheduled, customer meetings.

Cisco has released software updates that address this vulnerability. 
Workarounds are available to address this vulnerability. This advisory is 
available at the following 

Affected Products

Vulnerable Products
This vulnerability affects the following releases of Cisco WebEx Meetings 

Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.

Cisco has confirmed that this vulnerability does not affect the following 
Cisco-hosted WebEx products: 
Cisco WebEx Meeting Center 
Cisco WebEx Training Center 
Cisco WebEx Event Center 
Cisco WebEx Support Center 
Cisco WebEx Meetings


Customers can enable the Short URL functionality for their individual releases
by following the steps in the guide for the appropriate release detailed in 
the following list. Note: Customers are recommended to configure the block 
long URL links option below the Short URL function. Once the block long URL 
links functionality is activated, all previously scheduled meetings become 
invalid. Customers must reschedule all existing recurring meetings. It is also
recommended that customers change their meeting passwords when rescheduling 
for added security protections.

Guides for Enabling Short URL Functionality 
Administration Guide for Release 2.5 
Administration Guide for Release 2.6 
Administration Guide for Release 2.7
Administration Guide for Release 2.8

Fixed Software

Cisco has released free software updates that address the vulnerability 
described in this advisory. Customers may only install and expect support for
software versions and feature sets for which they have purchased a license. By
installing, downloading, accessing, or otherwise using such software upgrades,
customers agree to follow the terms of the Cisco software 

Additionally, customers may only download software for which they have a valid
license, procured from Cisco directly, or through a Cisco authorized reseller
or partner. In most cases this will be a maintenance upgrade to software that
was previously purchased. Free security software updates do not entitle 
customers to a new software license, additional software feature sets, or 
major revision upgrades.

When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, to determine exposure and a complete upgrade 

In all cases, customers should ensure that the devices to be upgraded contain
sufficient memory and confirm that current hardware and software 
configurations will continue to be supported properly by the new release. If 
the information is not clear, customers are advised to contact the Cisco 
Technical Assistance Center (TAC) or their contracted maintenance providers.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service 
contract and customers who make purchases through third-party vendors but are
unsuccessful in obtaining fixed software through their point of sale should 
obtain upgrades by contacting the Cisco 

Customers should have the product serial number available and be prepared to 
provide the URL of this advisory as evidence of entitlement to a free upgrade.

Fixed Releases

Cisco WebEx Meetings Server software can be downloaded from the Download 
Software site by navigating to Products > Conferencing > Web Conferencing > 
WebEx Meetings Server.

Cisco WebEx 		First Fixed Release
Meetings Server  	for this Vulnerability
2.5 			2.5 MR6 Patch 6
2.6 			2.6 MR3 Security Patch 4
2.7 			2.7 MR2 Security Patch 6
2.8 			2.8 Security Patch 1

Note: After the patch is applied, customers are recommended to enable the 
block long URL links option, which will invalidate previously scheduled 
recurring meeting links. Should customers choose to not enable the block long
URL links option, previously scheduled meetings will continue to be available
for use. Cisco PSIRT recommends that when rescheduling meetings, customers 
change previously used passwords or utilize a password generator to create new
meeting passwords.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described 
in this advisory.


This vulnerability was reported to Cisco by Mohammed Adel.



Revision History

Version Description 		Section 	Status	Date
1.0 	Initial public release. - 		Final	2017-May-10

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