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AUSCERT External Security Bulletin Redistribution
Cisco Adaptive Security Appliance Software OSPFv2 Denial of
3 July 2015
AusCERT Security Bulletin Summary
Product: Cisco Adaptive Security Appliance (ASA) Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-4239
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Cisco Adaptive Security Appliance Software OSPFv2 Denial of Service
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 39612
First Published: 2015 July 02 20:02 GMT
Last Published: 2015 July 02 20:02 GMT
Port: Not available
Urgency: Unlikely Use
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.
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.
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.
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.
Cisco has released bug ID CSCus84220 for registered users, which contains
additional details and an up-to-date list of affected product versions.
An unauthenticated, adjacent attacker could exploit this vulnerability to
cause an affected system to crash, resulting in a DoS condition.
The vulnerability is due to improper handling of OSPFv2 packets by an affected
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.
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.
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 email@example.com.
The security vulnerability applies to the following combinations of products.
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.3 (2.243) | 100.13
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The urgency and severity ratings of this alert are not tailored to individual
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THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF
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TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES
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