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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
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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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