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computer vulnerability note 13199

Windows Phone: information disclosure via WiFi WPA2 PEAP-MS-CHAPv2

Synthesis of the vulnerability

An attacker can create a fake WiFi WPA2 access point to obtain encrypted data, then decrypt the PEAP-MS-CHAPv2 algorithm, in order to obtain victim's password, to access to sensitive information.
Impacted systems: Windows Mobile.
Severity of this alert: 2/4.
Consequences of an intrusion: user access/rights, data reading, data creation/edition, data deletion.
Pirate's origin: radio connection.
Creation date: 05/08/2013.
Références of this alert: 2876146, BID-61592, VIGILANCE-VUL-13199.

Description of the vulnerability

When Windows Phone connects to a Wi-Fi access point, it can use a WPA2 authentication, with the PEAP-MS-CHAPv2 protocol (Protected Extensible Authentication Protocol with Microsoft Challenge Handshake Authentication Protocol version 2).

However, a cryptographic weakness was announced in PEAP-MS-CHAPv2. An attacker can then retrieve the password.

An attacker can therefore create a fake WiFi WPA2 access point to obtain encrypted data, then decrypt the PEAP-MS-CHAPv2 algorithm, in order to obtain victim's password, to access to sensitive information.
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