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AUSCERT External Security Bulletin Redistribution
ESB-2015.2119
Cisco TelePresence Video Communication Server Expressway
Denial of Service Vulnerabilities
14 August 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco TelePresence Video Communication Server Expressway
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-4318 CVE-2015-4317
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=40443
http://tools.cisco.com/security/center/viewAlert.x?alertId=40444
Comment: This bulletin contains two (2) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Vulnerability Alert
Cisco TelePresence Video Communication Server Expressway Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 40444
Version: 1
First Published: 2015 August 13 20:14 GMT
Last Published: 2015 August 13 20:14 GMT
Port: Not available
CVE: CVE-2015-4317
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 5.0
CVSS Version 2.0
CVSS Temporal: 4.8
Version Summary: Cisco TelePresence Video Communication Server Expressway
contains a vulnerability that could allow an unauthenticated, remote attacker
to cause a denial of service condition on a targeted device. Updates are not
available.
Description
A vulnerability in the Cisco TelePresence Video Communication Server (VCS)
Expressway could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition.
The vulnerability is due to insufficient handling of malformed authentication
messages. An attacker could exploit this vulnerability by sending a crafted
authentication packet with invalid variables. An exploit could allow the
attacker to cause a partial availability condition due to the invalid packet
reaching the Connection Manager of the VCS.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
At the time this alert was first published, Cisco TelePresence VCS Expressway
version X8.5.2 was vulnerable. Later releases of Cisco TelePresence VCS
Expressway may also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, the attacker would need to send a crafted
authentication packet with invalid variables to a targeted device, making
exploitation more difficult in environments that restrict network access from
untrusted sources.
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 CSCuv40469 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 cause
a DoS condition on an affected system.
Technical Information
The vulnerability is due to insufficient handling of malformed authentication
messages by an affected system.
An unauthenticated, remote attacker could exploit this vulnerability by
sending a crafted authentication packet with invalid variables to a targeted
system. A successful exploit could result in a DoS condition.
Safeguards
Administrators are advised to contact the vendor regarding future updates and
releases.
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 TelePresence Video Communication Server (VCS) Expressway X8.5 .2
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.
- ----------------------------------------------------------------------------
Vulnerability Alert
Cisco TelePresence Video Communication Server Expressway Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 40443
Version: 1
First Published: 2015 August 13 20:14 GMT
Last Published: 2015 August 13 20:14 GMT
Port: Not available
CVE: CVE-2015-4318
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 5.0
CVSS Version 2.0
CVSS Temporal: 4.8
Version Summary: Cisco TelePresence Video Communication Server Expressway
contains a vulnerability that could allow an unauthenticated, remote attacker
to cause a denial of service condition on a targeted device. Updates are not
available.
Description
A vulnerability in the Cisco TelePresence Video Communication Server (VCS)
Expressway could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition.
The vulnerability is due to insufficient handling of malformed GET request
messages. An attacker could exploit this vulnerability by sending a crafted
packet with invalid variables. An exploit could allow the attacker to cause a
partial availability condition due to the invalid packet reaching the VCS.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
At the time this alert was first published, Cisco TelePresence VCS Expressway
version X8.5.2 was vulnerable. Later releases of Cisco TelePresence VCS
Expressway may also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, the attacker would need to send a crafted
packet with invalid variables to a targeted device, making exploitation more
difficult in environments that restrict network access from untrusted sources.
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 CSCuv40528 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 cause
a DoS condition on an affected system.
Technical Information
The vulnerability is due to insufficient handling of malformed GET request
messages by an affected system.
An unauthenticated, remote attacker could exploit this vulnerability by
sending a crafted packet with invalid variables to a targeted system. A
successful exploit could result in a DoS condition.
Safeguards
Administrators are advised to contact the vendor regarding future updates and
releases.
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 TelePresence Video Communication Server (VCS) Expressway X8.5 .2
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.
- --------------------------END INCLUDED TEXT--------------------
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