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Vulnerability of Cisco ASA Software: privilege escalation via WebVPN Portal Access Rule Bypass

Synthesis of the vulnerability 

An attacker can bypass restrictions via WebVPN Portal Access Rule Bypass of Cisco ASA Software, in order to escalate his privileges.
Impacted systems: ASA.
Severity of this alert: 2/4.
Creation date: 22/10/2020.
Références of this alert: CERTFR-2020-AVI-671, cisco-sa-asaftd-rule-bypass-P73ABNWQ, CSCvu75615, CVE-2020-3578, VIGILANCE-VUL-33671.

Description of the vulnerability 

An attacker can bypass restrictions via WebVPN Portal Access Rule Bypass of Cisco ASA Software, in order to escalate his privileges.
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This weakness bulletin impacts software or systems such as ASA.

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

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 announce.

Solutions for this threat 

Cisco ASA Software: solution CSCvu75615.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu75615
  https://tools.cisco.com/bugsearch/bug/CSCvu75615
  https://tools.cisco.com/quickview/bug/CSCvu75615
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