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Test ID:1.3.6.1.4.1.25623.1.0.140031
Category:CISCO
Title:Cisco Web Security Appliance MIME Header Bypass Vulnerability
Summary:A vulnerability in the email message and content filtering for malformed Multipurpose Internet Mail;Extensions (MIME) headers of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and;Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass the;filtering functionality of the targeted device. Emails that should have been quarantined could;instead be processed.;;The vulnerability is due to improper error handling when malformed MIME headers are present in the;email attachment. An attacker could exploit this vulnerability by sending an email with a crafted;attachment encoded with MIME. A successful exploit could allow the attacker to bypass the configured;email message and content filtering.;;Cisco has released software updates that address this vulnerability. Workarounds that address this;vulnerability are not available.;;;http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa2
Description:Summary:
A vulnerability in the email message and content filtering for malformed Multipurpose Internet Mail
Extensions (MIME) headers of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and
Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass the
filtering functionality of the targeted device. Emails that should have been quarantined could
instead be processed.

The vulnerability is due to improper error handling when malformed MIME headers are present in the
email attachment. An attacker could exploit this vulnerability by sending an email with a crafted
attachment encoded with MIME. A successful exploit could allow the attacker to bypass the configured
email message and content filtering.

Cisco has released software updates that address this vulnerability. Workarounds that address this
vulnerability are not available.


http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa2

Solution:
See the referenced vendor advisory for a solution.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2016-6372
BugTraq ID: 93911
http://www.securityfocus.com/bid/93911
CopyrightThis script is Copyright (C) 2016 Greenbone Networks GmbH

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