Call Interception

Popularity:

7

Simplicity:

7

Impact:

7

Risk Rating:

7

Using different techniques involving the abuse of the SIP signaling protocol, attackers can intercept calls. For instance, the 3XX SIP response codes class corresponds to redirects and informs the caller that further actions have to be undertaken in order to successfully fulfill the initial request. By forging malicious 3XX response codes (301 Moved

Permanently, 302 Moved Temporarily, and so on) or crafting a REINVITE message, an attacker can reroute the call-flow, thus impersonating a proxy or a UA; trace CDR data such as source and destination numbers; log DTMF codes; and even intercept actual conversations.

Consequently, this attack can compromise each requirement of the CIA paradigm, specifically leading to call tracing (and sometimes eavesdropping), call hijacking and possibly denial of service.

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