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Vulnerability of Cisco ASA: Cross Site Scripting via WebVPN

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via WebVPN of Cisco ASA, in order to run JavaScript code in the context of the web site.
Vulnerable products: ASA.
Severity of this weakness: 2/4.
Creation date: 19/04/2018.
Références of this bulletin: CERTFR-2018-AVI-194, cisco-sa-20180418-asawvpn, CSCvg33985, CVE-2018-0242, VIGILANCE-VUL-25914.

Description of the vulnerability 

The Cisco ASA product offers a web service.

However, it does not filter received data via WebVPN before inserting them in generated HTML documents.

An attacker can therefore trigger a Cross Site Scripting via WebVPN of Cisco ASA, in order to run JavaScript code in the context of the web site.
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This threat alert impacts software or systems such as ASA.

Our Vigil@nce team determined that the severity of this computer vulnerability 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 weakness note.

Solutions for this threat 

Cisco ASA: solution CSCvg33985.
The solution is described on the Cisco site:
  https://tools.cisco.com/bugsearch/bug/CSCvg33985
  https://tools.cisco.com/quickview/bug/CSCvg33985
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Computer vulnerabilities tracking service 

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