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Vulnerability of Cisco Email Security Appliance: privilege escalation via MIME Header

Synthesis of the vulnerability 

An attacker can bypass restrictions via MIME Header of Cisco Email Security Appliance, in order to escalate his privileges.
Vulnerable software: AsyncOS, Cisco ESA.
Severity of this announce: 2/4.
Creation date: 30/11/2017.
Revision date: 11/12/2017.
Références of this computer vulnerability: cisco-sa-20171129-esa, CSCvf44666, CVE-2017-12353, VIGILANCE-VUL-24577.

Description of the vulnerability 

An attacker can bypass restrictions via MIME Header of Cisco Email Security Appliance, in order to escalate his privileges.
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This computer threat note impacts software or systems such as AsyncOS, Cisco ESA.

Our Vigil@nce team determined that the severity of this weakness alert is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer weakness note.

Solutions for this threat 

Cisco Email Security Appliance: solution CSCvf44666.
The solution is described on the Cisco site:
  https://tools.cisco.com/bugsearch/bug/CSCvf44666
  https://tools.cisco.com/quickview/bug/CSCvf44666
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