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AUSCERT External Security Bulletin Redistribution
ESB-2015.1762
Cisco Adaptive Security Appliance Software OSPFv2 Denial of
Service Vulnerability
3 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance (ASA) Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4239
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39612
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Vulnerability Alert
Cisco Adaptive Security Appliance Software OSPFv2 Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 39612
Version: 1
First Published: 2015 July 02 20:02 GMT
Last Published: 2015 July 02 20:02 GMT
Port: Not available
CVE: CVE-2015-4239
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 6.1
CVSS Version 2.0
CVSS Temporal: 5.0
Version Summary: Cisco Adaptive Security Appliance contains a vulnerability
that could allow an unauthenticated, adjacent attacker to cause a denial of
service condition. Updates are available.
Description
A vulnerability in the Open Shortest Path First version 2 (OSPFv2) code of
Cisco Adaptive Security Appliance (ASA) Software could allow an
unauthenticated, adjacent attacker to cause the reload of the affected system.
The vulnerability is due to improper handling of OSPFv2 packets. An attacker
could exploit this vulnerability by sending crafted packets to the affected
system. A successful exploit could cause the system to crash, 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 ASA Software releases
100.13(0.21) and 9.3(2.243)were vulnerable. Later releases of Cisco ASA
Software may also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker must be on the same broadcast or
collision domain as the targeted system. This access requirement reduces 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 CSCus84220 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An unauthenticated, adjacent attacker could exploit this vulnerability to
cause an affected system to crash, resulting in a DoS condition.
Technical Information
The vulnerability is due to improper handling of OSPFv2 packets by an affected
system.
An unauthenticated, adjacent attacker could exploit this vulnerability by
sending crafted OSPFv2 packets to a targeted system. A successful exploit
could cause the system 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 Adaptive Security Appliance (ASA) Software 9.3 (2.243) | 100.13
(0.21)
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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