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AUSCERT External Security Bulletin Redistribution
ESB-2015.2095
Cisco Media Convergence Server WebEx Node Open Redirect Vulnerability
13 August 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Media Convergence Server WebEx Node
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2015-4297
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=40427
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Vulnerability Alert
Cisco Media Convergence Server WebEx Node Open Redirect Vulnerability
Threat Type: CWE-20: Input Validation
IntelliShield ID: 40427
Version: 1
First Published: 2015 August 12 20:18 GMT
Last Published: 2015 August 12 20:18 GMT
Port: Not available
CVE: CVE-2015-4297
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Harassment
CVSS Base: 5.0
CVSS Temporal: 4.8
Version Summary:
Cisco WebEx Node for Cisco Media Convergence Server contains a vulnerability
that could allow an unauthenticated, remote attacker to conduct open
redirect attacks. Updates are not available.
Description
A vulnerability in the Cisco WebEx Node for Cisco Media Convergence Server
(MCS) web interface could allow an unauthenticated, remote attacker to
redirect a user to a undesired web page.
The vulnerability is due to improper input validation of the parameters
in the HTTP request. An attacker could exploit this vulnerability by
crafting an HTTP request that could cause the web application to redirect
the request to a specified malicious Uniform Resource Locator (URL).
Cisco has confirmed the vulnerability; however, software updates are
not available.
Warning Indicators
Cisco WebEx Node for Cisco MCS is vulnerable.
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs
a user to a malicious site and use misleading language or instructions to
persuade the user to follow the provided link.
Cisco indicates through the CVSS score that functional exploit code exists;
however, the code is not known to be publicly available.
Vendor Announcements
Cisco has released bug ID CSCuv32136 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An unauthenticated, remote attacker could exploit this vulnerability to
redirect a user's browser from the affected application to an arbitrary,
attacker-controlled site. A successful exploit could be used to conduct
further attacks.
Technical Information
The vulnerability is due to insufficient validation of user-supplied input
processed by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by
convincing a user to follow a crafted URL. If successful, the attacker
could redirect the targeted user to an attacker-specified website which
could aid the attacker in conducting further attacks.
Safeguards
Administrators are advised to contact the vendor regarding future updates
and releases.
Users are advised not to visit websites or follow links that have suspicious
characteristics or cannot be verified as safe.
Administrators are advised to allow only trusted users to have network
access.
Administrators are advised to monitor affected systems.
Patches/Software
Software updates are not available.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco WebEx Node for MCS Original Release Base
Associated Products:
N/A
LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to
individual users; users may value alerts differently based upon their
network configurations and circumstances. THE ALERT, AND INFORMATION
CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION
CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN
RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON
OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT
NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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