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AUSCERT External Security Bulletin Redistribution
ESB-2015.0873
Cisco ASR1000 Series Routers ESP Module Denial of Service Vulnerability
8 April 2015
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AusCERT Security Bulletin Summary
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Product: Cisco ASR1000 Series Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0688
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=38210
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Vulnerability Alert
Cisco ASR1000 Series Routers ESP Module Denial of Service Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 38210
Version: 1
First Published: 2015 April 03 14:12 GMT
Last Published: 2015 April 03 14:12 GMT
Port: Not available
CVE: CVE-2015-0688
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 5.4
CVSS Version 2.0
CVSS Temporal: 4.5
Version Summary: Cisco ASR 1000 Series Routers Aggregation Services Routers
contain a vulnerability that could allow an unauthenticated, remote attacker
to cause a denial of service condition. Updates are available.
Description
A vulnerability in the Embedded Services Processor (ESP) module of Cisco ASR
1000 Series Routers running Cisco IOS XE Software could allow an
unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to improper handling of malformed H.323 packets by an
affected device when the device is configured to use Network Address
Translation (NAT). An unauthenticated, remote attacker could exploit this
vulnerability by sending malformed H.323 packets to a targeted device. A
successful exploit could cause the ESP module on the device to crash,
resulting in a DoS condition.
Cisco has confirmed the vulnerability and released software updates.
Warning Indicators
At the time this alert was first published, Cisco IOS XE Software for Cisco
ASR 1000 Series Routers version 3.10.2S was vulnerable. Other versions of
Cisco IOS XE Software for Cisco ASR 1000 Series Routers may also be affected.
IntelliShield Analysis
To exploit this vulnerability, an attacker may need to obtain additional
information such as whether the targeted device is configured to use NAT. In
addition, the attacker may need access to trusted, internal networks to send
H.323 packets to the device. These requirements could limit the possibility of
a successful exploit.
Vendor Announcements
Cisco has released bug ID CSCup21070 for registered users that contains
additional details and an up-to-date list of affected product versions.
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause
the ESP module in an affected device to crash, resulting in a DoS condition.
Technical Information
The vulnerability is due to improper handling of malformed H.323 packets by an
affected device when the device is configured to use NAT.
An unauthenticated, remote attacker could exploit this vulnerability by
sending malformed H.323 packets to a targeted device. A successful exploit
could cause the ESP module on the device to crash, resulting in a DoS
condition.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Patches/Software
Cisco customers with active contracts can obtain updates through the Software
Center at the following link: Cisco. Cisco customers without contracts can
obtain upgrades by contacting the Cisco Technical Assistance Center at
1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco IOS XE Software 3.10S .2
Associated Products:
N/A
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security
IntelliShield Alert Manager Service. This customizable threat and
vulnerability alert service provides security staff with access to timely,
accurate, and credible information about threats and vulnerabilities that may
affect their environment.
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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