Cisco Security AdvisoryMedium
Advisory ID:
cisco-sa-20160817-asa-cli
First Published:
2016 August 17 18:45 GMT
Last Updated:
2016 August 18 21:12 GMT
Version 1.1:
Workarounds:
No workarounds available
Cisco Bug IDs:
CVSS Score:
Base 6.8,
Temporal 5.9
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AV:L/AC:L/Au:S/C:C/I:C/A:C/E:H/RL:OF/RC:C
Click Icon to Copy Verbose Score
AV:L/AC:L/Au:S/C:C/I:C/A:C/E:H/RL:OF/RC:C
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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:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-cli
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Vulnerable Products
Cisco Adaptive Security Appliance (ASA) Software Releases earlier than 8.4(3) 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)*
* Note: Cisco Firewall Service Modules and Cisco PIX Firewalls have passed the last day of software support milestone as stated in the published End of Life (EoL) documents. Further investigations into these devices will not be performed, and fixed software will not be made available. Please see the following EoL documents for further information:
- Cisco Firewall Services Module (FWSM)
http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/catalyst-6500-series-firewall-services-module/eol_c51-699134.html - Cisco PIX Firewalls
http://www.cisco.com/c/en/us/products/security/pix-500-series-security-appliances/eos-eol-notice-listing.html
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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There are no workarounds that address this vulnerability.
An attacker must be authenticated to trigger this vulnerability. Given their role in a customer’s 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.
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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
The following table indicates the earliest software releases that include fixes for this vulnerability:
Cisco ASA Major Release First Fixed Release 7.2 Affected, migrate to 8.4(3) or later 8.0 Affected, migrate to 8.4(3) or later 8.1 Affected, migrate to 8.4(3) or later 8.2 Affected, migrate to 8.4(3) or later 8.3 Affected, migrate to 8.4(3) or later 8.4 8.4(3) 8.5 Affected, migrate to 9.0(1) or later 8.6 Affected, migrate to 9.0(1) or later 8.7 Affected, migrate to 9.0(1) or later 9.0 9.0(1) 9.1 Not affected 9.2 Not affected 9.3 Not affected 9.4 Not affected 9.5 Not affected 9.6 Not affected
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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.
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The exploit of this vulnerability was publicly disclosed by the alleged Shadow Brokers group.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.1 Clarified first fixed software version, added table of affected software. Affected Products, Fixed Software Final 2016-August-18 1.0 Initial public release. — Final 2016-August-17
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