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AUSCERT External Security Bulletin Redistribution
ESB-2015.2084
Cisco ASR 9000 Series Aggregation Services Routers tmp Files
Denial of Service Vulnerability
12 August 2015
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AusCERT Security Bulletin Summary
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Product: Cisco ASR 9000 Series Aggregation Services Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4277
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39939
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Vulnerability Alert
Cisco ASR 9000 Series Aggregation Services Routers tmp Files Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 39939
Version: 1
First Published: 2015 August 11 22:36 GMT
Last Published: 2015 August 11 22:36 GMT
Port: Not available
CVE: CVE-2015-4277
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 4.6
CVSS Temporal: 3.8
Version Summary: Cisco ASR 9000 Series Aggregation Services Routers
contain a vulnerability that could allow an authenticated, local attacker to
cause a denial of service condition. Updates are available.
Description
A vulnerability in Cisco ASR 9000 Series Aggregation Services Routers could
allow an authenticated, local attacker to produce excessive tmp/*config files,
causing the system to become unresponsive.
The vulnerability is due to the abrupt closure of the user's vty sessions after
the commit/end in global configuration mode. An attacker could exploit this
vulnerability by using methods to generate excessive tmp/*config files, causing
the affected system's memory to be exhausted, resulting in a denial of service
(DoS) condition.
Cisco has confirmed the vulnerability and released software updates.
Warning Indicators
At the time this alert was first published, Cisco ASR 9000 Series Aggregation
Services Routers Releases 5.1.3 and 5.3.0 were vulnerable. Later releases may
also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker must authenticate and have local
access to the targeted device. These access requirements may reduce the
likelihood of a successful exploit.
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 CSCut93842 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An authenticated, local attacker could exploit this vulnerability to cause an
affected device to become unresponsive, resulting in a DoS condition.
Technical Information
The vulnerability is due to the abrupt closing of a user's vty session after
the commit/end in global configuration mode.
An authenticated, local attacker could exploit this vulnerability by using
methods to generate excessive tmp/*config files, causing the affected system's
memory to be exhausted, resulting in a DoS condition.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access
administration or management systems.
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 ASR 9000 Series Aggregation Services Routers
5.3.0 Base | 5.1.3 Base
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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