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Vulnerability of Cisco Web Security Appliance: code execution via Log Subscription Subsystem

Synthesis of the vulnerability 

An attacker can use a vulnerability via Log Subscription Subsystem of Cisco Web Security Appliance, in order to run code.
Vulnerable products: AsyncOS, Cisco WSA.
Severity of this weakness: 2/4.
Creation date: 02/05/2019.
Références of this bulletin: CERTFR-2019-AVI-193, cisco-sa-20190501-wsa-privesc, CSCvk68106, CVE-2019-1816, VIGILANCE-VUL-29190.

Description of the vulnerability 

An attacker can use a vulnerability via Log Subscription Subsystem of Cisco Web Security Appliance, in order to run code.
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This security alert impacts software or systems such as AsyncOS, Cisco WSA.

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

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

An attacker with a expert ability can exploit this security announce.

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvk68106.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk68106
  https://tools.cisco.com/bugsearch/bug/CSCvk68106
  https://tools.cisco.com/quickview/bug/CSCvk68106
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