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AUSCERT External Security Bulletin Redistribution
Cisco Email and Web Security Appliance JAR Advanced Malware
Protection DoS Vulnerability
28 October 2016
AusCERT Security Bulletin Summary
Product: Cisco Email Security Appliances (ESA)
Cisco Web Security Appliances (WSA)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2016-6360
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Cisco Security Advisory
Cisco Email and Web Security Appliance JAR Advanced Malware Protection DoS
Advisory ID: cisco-sa-20161026-esawsa3
First Published: 2016 October 26 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 5.0, Temporal 4.1
Base 5.0, Temporal 4.1 AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
A vulnerability in Advanced Malware Protection (AMP) for Cisco Email Security
Appliances (ESA) and Web Security Appliances (WSA) could allow an
unauthenticated, remote attacker to cause a partial denial of service (DoS)
condition due to the AMP process unexpectedly restarting.
The vulnerability is due to improper validation of a Java Archive (JAR) file
scanned when AMP is configured. An attacker could exploit this vulnerability
by crafting a JAR file, and attaching this JAR file to an email that is then
sent through the affected device. An exploit could allow the attacker to cause
the Cisco ESA and WSA AMP process to unexpectedly restart due to the malformed
Cisco has released software updates that address this vulnerability.
Workarounds that address this vulnerability are not available.
This advisory is available at the following link:
The following products are affected:
Cisco AsyncOS Software for Email Security Appliances (ESA) versions 9.5 and
later up to the first fixed release
Cisco AsyncOS Software for Web Security Appliances (WSA) all versions prior to
the first fixed release
To determine which release of Cisco AsyncOS Software is running on an ESA,
administrators can use the version command in the CLI. The following example
shows the output of the version command for an ESA running Cisco AsyncOS
Software Release 8.5.7-044:
Product: Cisco IronPort X1070 Messaging Gateway(tm) Appliance
Note that Cisco provides regular maintenance of products in the Cisco Cloud
Email Security (CES) service solution, which includes Cisco Email Security
Appliances and Cisco Content Security Management Appliances. Customers can
also request a software upgrade by contacting Cisco CES support.
To determine whether a vulnerable version of Cisco AsyncOS Software is running
on a Cisco WSA, administrators can use the version command in the WSA CLI. The
following example shows the results for an appliance running Cisco AsyncOS
Software version 8.5.3-051:
Product: Cisco IronPort S670 Web Security Appliance
Products Confirmed Not Vulnerable
The following products are not vulnerable:
Content Security Management Appliance
FireSIGHT System Software
AnyConnect Secure Mobility Client for iOS
AnyConnect Secure Mobility Client for Mac OS X
AnyConnect Secure Mobility Client for Android
AnyConnect Secure Mobility Client for Windows
AnyConnect Secure Mobility Client for Linux
No other Cisco products are currently known to be affected by this
Indicators of Compromise
Exploitation of this vulnerability could cause the malformed JAR file to be
marked as UNSCANNABLE and the following error logged:
<Date> Info: MID <####> AMP file reputation verdict : UNSCANNABLE
The ESA and WSA could also write out a core file for the AMP process. Contact
the Cisco Technical Assistance Center (TAC) to review the core file and
confirm if the core file shows that the device has been compromised by this
Workarounds that address this vulnerability are not available.
Cisco provides information about fixed software in Cisco bugs, which are
accessible through the Cisco Bug Search Tool.
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade
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.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.
This vulnerability was found during resolution of a support case.
Version Description Section Status Date
1.0 Initial public release. Final 2016-October-26
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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