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Vulnerability of Thomson SpeedTouch ST780: script injection in the administration page

Synthesis of the vulnerability 

An attacker can setup a DNS redirect, and then invite the victim to display the help page of Thomson SpeedTouch ST780, in order to execute JavaScript code in the context of the administration web service.
Vulnerable software: SpeedTouch.
Severity of this announce: 1/4.
Creation date: 25/09/2012.
Références of this computer vulnerability: VIGILANCE-VUL-11977, waraxe-2012-SA#090.

Description of the vulnerability 

The administration interface of Thomson SpeedTouch ST780 uses an SSL/TLS encrypted session, so Man-in-the-Middle attacks cannot be used.

The help page of the administration interface includes a remote script:
  http://downloads.thomson.net/telecom/documentation/common/STFEH/R744/RES/en/anchors.js
However, as the url does not use https, if the attacker redirects "downloads.thomson.net" to a malicious web site, the "anchors.js" script will be loaded from attacker's web site.

An attacker can therefore setup a DNS redirect, and then invite the victim to display the help page of Thomson SpeedTouch ST780, in order to execute JavaScript code in the context of the administration web service.
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This threat note impacts software or systems such as SpeedTouch.

Our Vigil@nce team determined that the severity of this cybersecurity note is low.

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

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

Solutions for this threat 

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