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Vulnerability of Cisco WSA: privilege escalation via Layer 4 Traffic Monitor

Synthesis of the vulnerability 

An attacker can bypass restrictions via Layer 4 Traffic Monitor of Cisco WSA, in order to escalate his privileges.
Vulnerable systems: AsyncOS, Cisco WSA.
Severity of this threat: 3/4.
Creation date: 07/06/2018.
Références of this weakness: CERTFR-2018-AVI-270, cisco-sa-20180606-wsa, CSCvg78875, CVE-2018-0353, VIGILANCE-VUL-26348.

Description of the vulnerability 

An attacker can bypass restrictions via Layer 4 Traffic Monitor of Cisco WSA, in order to escalate his privileges.
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This security bulletin impacts software or systems such as AsyncOS, Cisco WSA.

Our Vigil@nce team determined that the severity of this cybersecurity announce is important.

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

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat 

Cisco WSA: solution CSCvg78875.
The solution is described on the Cisco site:
  https://tools.cisco.com/bugsearch/bug/CSCvg78875
  https://tools.cisco.com/quickview/bug/CSCvg78875
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