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Vulnerability of Cisco Email Security Appliance: privilege escalation via Zip Content Filter Bypass

Synthesis of the vulnerability 

An attacker can bypass restrictions via Zip Content Filter Bypass of Cisco Email Security Appliance, in order to escalate his privileges.
Impacted products: AsyncOS, Cisco ESA.
Severity of this bulletin: 2/4.
Creation date: 04/11/2020.
Références of this threat: CERTFR-2020-AVI-713, cisco-sa-esa-zip-bypass-gbU4gtTg, CSCvv38679, CVE-2020-26082, VIGILANCE-VUL-33813.

Description of the vulnerability 

An attacker can bypass restrictions via Zip Content Filter Bypass of Cisco Email Security Appliance, in order to escalate his privileges.
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This security weakness impacts software or systems such as AsyncOS, Cisco ESA.

Our Vigil@nce team determined that the severity of this threat bulletin 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 threat.

Solutions for this threat 

Cisco Email Security Appliance: solution CSCvv38679.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv38679
  https://tools.cisco.com/bugsearch/bug/CSCvv38679
  https://tools.cisco.com/quickview/bug/CSCvv38679
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