ESB-2017.3046 - [Cisco] Cisco Email Security Appliances (ESA): Reduced security - Remote/unauthenticated 2017-11-30

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3046
                           cisco-sa-20171129-esa
                             30 November 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Email Security Appliances (ESA)
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12353  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171129-esa

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Medium

 Advisory ID:

cisco-sa-20171129-esa

First Published: 2017 November 29 16:00 GMT

 Version 1.0:

Final

Workarounds:

No workarounds available

Cisco Bug IDs: CSCvf44666 CVE-2017-12353 CWE-254 CVSS Score: Base 5.8 
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X

 Summary

 A vulnerability in the Multipurpose Internet Mail Extensions (MIME) scanner 
of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could 
allow an unauthenticated, remote attacker to bypass configured user filters on
the device. The vulnerability is due to improper error handling of a malformed
MIME header in an email attachment. An attacker could exploit this 
vulnerability by sending an email with a crafted MIME attachment. For example,
a successful exploit could allow the attacker to bypass configured user 
filters to drop the email. The malformed MIME headers may not be RFC 
compliant. However, some mail clients could still allow users to access the 
attachment, which may not have been properly filtered by the device. There are
no workarounds that address this vulnerability. This advisory is available at
the following link: 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ 
cisco-sa-20171129-esa

Affected Products

 Vulnerable Products

This vulnerability affects Cisco Email Security Appliance (ESA). For 
information about affected software releases, consult the Cisco bug ID at the
top of this advisory.

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.

Fixed Software

 For information about fixed software releases, consult the Cisco bug ID(s) at
the top of this advisory. 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.

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 internally reported to the Cisco PSIRT by Mai Ngoc 
Duong.

Cisco Security Vulnerability Policy

 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.

 URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ 
cisco-sa-20171129-esa

Revision History
Version	Description		Section	Status	Date
1.0	Initial public release.	—	Final	2017-November-29

 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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