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AUSCERT External Security Bulletin Redistribution
ESB-2016.1983
Cisco Adaptive Security Appliance CLI Remote Code Execution Vulnerability
18 August 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-6367
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-cli
Comment: Cisco Systems has confirmed the existence of an exploit targeting
CVE-2016-6367 in the wild.
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Cisco Adaptive Security Appliance CLI Remote Code Execution Vulnerability
Medium
Advisory ID:
cisco-sa-20160817-asa-cli
First Published:
2016 August 17 18:45 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCtu74257
CVSS Score:
Base 6.8, Temporal 5.9
CVE-2016-6367
CWE-119
Summary
A vulnerability in the command-line interface (CLI) parser of Cisco Adaptive
Security Appliance (ASA) Software could allow an authenticated, local attacker
to create a denial of service (DoS) condition or potentially execute arbitrary
code. An attacker could exploit this vulnerability by invoking certain invalid
commands in an affected device.
Cisco has released software updates that address this vulnerability. There are
no workarounds that address this vulnerability. This advisory is available at
the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-cli
Affected Products
Vulnerable Products
Cisco Adaptive Security Appliance (ASA) Software Releases earlier than 8.4(1)
are vulnerable. An attacker must have local access and be authenticated to
exploit this vulnerability.
Affected Cisco ASA Software running on the following products may be affected
by this vulnerability:
Cisco ASA 5500 Series Adaptive Security Appliances
Cisco ASA 5500-X Series Next-Generation Firewalls
Cisco PIX Firewalls
Cisco Firewall Services Module (FWSM)
Refer to the "Fixed Software" section for additional information about fixed
releases.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
There are no workarounds that address this vulnerability.
An attacker must be authenticated to trigger this vulnerability. Given their
role in a customers infrastructure, networking devices are a valuable target
for threat actors and should be protected as such. Cisco recommends that
customers of all networking vendors include in their operational procedures
methods for preventing and detecting compromise. Please refer to the Cisco
Guide to Harden Cisco ASA Firewall, which contains information to help secure
Cisco ASA devices and increase the overall security of the network.
Fixed Software
When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, to determine exposure and a complete upgrade
solution.
In all cases, customers should ensure that the devices to be upgraded contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance providers.
Fixed Releases
This vulnerability has been fixed in Cisco ASA Software Releases 8.4.1 and
later. All previous releases are affected.
Exploitation and Public Announcements
On August 15, 2016, Cisco was alerted to information posted online by the
Shadow Brokers group, which claimed to possess disclosures from the Equation
Group. The posted materials included exploits for firewall products from
multiple vendors. The Cisco products mentioned were the PIX and ASA firewalls.
Source
The exploit of this vulnerability was publicly disclosed by the alleged Shadow
Brokers group.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-cli
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2016-August-17
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
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