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Vulnerability of Aastra Phone 6753i: denial of service via telnet

Synthesis of the vulnerability 

An attacker can connect via telnet on Aastra Phone, in order to trigger a denial of service.
Impacted software: Aastra Phone.
Severity of this computer vulnerability: 2/4.
Creation date: 08/04/2013.
Références of this announce: BID-58935, DEF30173/CLN30178/CLN30179, VIGILANCE-VUL-12616.

Description of the vulnerability 

The Aastra 6753i IP Telephone has a telnet access.

However, the password for the "admin" user is constant. An attacker can thus login on the phone. It can be noted that entered commands usually lead to a system stop.

An attacker can therefore connect via telnet on Aastra Phone, in order to trigger a denial of service.
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This computer threat impacts software or systems such as Aastra Phone.

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

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this cybersecurity weakness.

Solutions for this threat 

Aastra Phone 6753i: version 3.2.2 SP3.
The version 3.2.2 SP3 is fixed:
  http://www.aastra.com/document-library.htm?curr_fam=Aastra+6750i&curr_nav=2&prod_id=6848
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