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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2526 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 Resolution: Patch/Upgrade CVE Names: CVE-2016-6360 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa3 - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Email and Web Security Appliance JAR Advanced Malware Protection DoS Vulnerability Medium 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: CSCux56406 CSCux59928 CVSS Score: 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 CVE-2016-6360 CWE-119 Summary 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 JAR file. 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: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa3 Affected Products Vulnerable Products 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: ciscoesa> version Current Version =============== Product: Cisco IronPort X1070 Messaging Gateway(tm) Appliance Model: X1070 Version: 8.5.7-044 . . . 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: ciscowsa> version Current Version =============== Product: Cisco IronPort S670 Web Security Appliance Model: S670 Version: 8.5.3-051 . . . 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 vulnerability. 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 vulnerability. Workarounds Workarounds that address this vulnerability are not available. Fixed Software 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 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. 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. Source This vulnerability was found during resolution of a support case. URL http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa3 Revision History Version Description Section Status Date 1.0 Initial public release. Final 2016-October-26 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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