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AUSCERT External Security Bulletin Redistribution
ESB-2015.2097
Cisco Nexus 9000 Series Resource Exhaustion Denial of Service Vulnerability
13 August 2015
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AusCERT Security Bulletin Summary
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Product: Cisco Nexus 9000 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4301
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=40431
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Vulnerability Alert
Cisco Nexus 9000 Series Resource Exhaustion Denial of Service Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 40431
Version: 1
First Published: 2015 August 12 21:41 GMT
Last Published: 2015 August 12 21:41 GMT
Port: Not available
CVE: CVE-2015-4301
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 4.0
CVSS Temporal: 4.0
Version Summary: Cisco Nexus 9000 Series Switches contain a
vulnerability that could allow an authenticated, remote attacker to cause
a denial of service condition. Updates are available.
Description
A vulnerability in Cisco Nexus 9000 Series software could allow an
authenticated, remote attacker to cause a denial of service (DoS) condition.
An attacker could exploit the vulnerability by copying large files to the
device file system. Processing the large files could cause the device to
stop responding, 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 Nexus 9000 Series Software
Release 11.1(1c) was vulnerable. Later releases may also be affected.
IntelliShield Analysis
To exploit the vulnerability, an attacker must have authentication
credentials to log in to the device and privileges that allow copying large
files to the file system. These restrictions greatly reduce the potential
for exploitation.
Vendor Announcements
Cisco has released bug ID CSCuu77225 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An authenticated, remote attacker could exploit this vulnerability to
cause a targeted device to consume available memory resources, resulting
in a DoS condition.
Technical Information
The vulnerability is due to improper handling of large files stored in
the /tmp directory.
An authenticated, remote attacker with sufficient privileges could exploit
the vulnerability by copying files into the /tmp directory. The processing
of the files could cause the device to consume available memory resources,
preventing system access to legitimate users, 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 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 NX-OS Software for Nexus 9000 Series 11.1(1c)
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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