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AUSCERT External Security Bulletin Redistribution
ESB-2013.0351
Cisco Small Business Switches SSH Packet Processing Denial
of Service Vulnerability
8 March 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Small Business Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-1154
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=27502
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Cisco Small Business Switches SSH Packet Processing Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 27502
Version: 1
First Published: March 06, 2013 01:23 PM EST
Last Published: March 06, 2013 01:23 PM EST
Vector: Network
Authentication: None
Exploit: Functional
Port: Not Available
CVE: CVE-2013-1154
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 5.0
CVSS Temporal: 4.1
Version Summary:
Cisco Small Business Switches contain a vulnerability that could allow an
unauthenticated, remote attacker to cause a denial of service condition on a
targeted device. Updates are available.
Description
Cisco Small Business Switches contain a vulnerability that could allow an
unauthenticated, remote attacker to cause a denial of service (DoS) condition
to features that rely on SSH or SSL protocols.
The vulnerability is due to the processing flaw in malformed packets in the
code used by SSH and SSL. An unauthenticated, remote attacker could exploit
this vulnerability by sending malformed SSH or SSL packets to the device. An
exploit could allow the attacker to cause a denial of service for the features
requiring SSH or SSL support.
Cisco has confirmed this vulnerability and released updated software.
Warning Indicators
The following Cisco Small Business Series Switches are vulnerable:
Cisco Small Business 200 Series Smart Switch versions 1.2.7.76 and prior
Cisco Small Business 300 Series Managed Switch versions 1.2.7.76 and prior
Cisco Small Business 500 Series Stackable Managed Switch version 1.2.7.76 and
prior
IntelliShield Analysis
To exploit this vulnerability, an attacker must be able to send crafted SSH or
SSL packets to the targeted device which may require the attacker to have
access to trusted, internal networks, decreasing the likelihood of a
successful attack.
The vulnerability does not affect the entire device. Features that need the
SSL/TLS layer to encrypt data such as SSH, HTTPS, and Secure Sensitive Data
are affected.
Cisco would like to thank Hisashi Kojima and Masahiro Nakada of Fujitsu
Laboratories LTD for discovering this vulnerability.
Vendor Announcements
Cisco has confirmed this vulnerability in the following Cisco bug ID:
CSCua30246
Impact
An unauthenticated, remote attacker could exploit this vulnerability by
sending crafted SSH or SSL packets to a vulnerable device. Successful
exploitation could cause features utilizing the SSL/TLS layer on the vulnerable
device to become unresponsive, resulting in a DoS condition.
Technical Information
The vulnerability is due to the improper processing of malformed SSH or SSL
packets by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending
malformed SSH or SSL packets to the targeted device. Successful exploitation
could allow the attacker to cause a DoS condition for the features requiring
SSH or SSL support on a targeted device.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to
allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by
using a solid firewall strategy.
Administrators are advised to monitor critical 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 e-mail at tac@cisco.com.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco Small 1.1 .0.73, .1.8, .2.0 | 1.2 .0.97, .7.76
Business 200 Series
Smart Switches
Cisco Cisco Small 1.1 .0.73, .1.8, .2.0 | 1.2 .0.97, .7.76
Business 300 Series
Managed Switches
Cisco Cisco Small 1.2 .0.97, .7.76
Business 500 Series
Stackable Managed
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
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for full access, please visit the IntelliShield trial registration page.
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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