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Assessment Title
Rule Text
The Session Border Controller (SBC) must be configured to validate the structure and validity of SIP and AS-SIP messages so that malformed messages or messages containing errors are dropped before action is taken on the contents.
Description
Discussion Text
Malformed SIP and AS_SIP messages, as well as messages containing errors, could be an indication that an adversary is attempting some form of attack or denial of service. Such an attack is called fuzzing. Fuzzing is the deliberate sending of signaling messages that contain errors in an attempt to cause the target device to react in an inappropriate manner, such as failure that causes a denial of service or permitting traffic to pass that it would not normally permit.
In some cases, a target can be flooded with fuzzed messages. The SBC must not act on any portion of a signaling message that contains errors. A malformed or erroneous message could be sent by the signaling partner and be properly hashed for integrity.
In some cases, a target can be flooded with fuzzed messages. The SBC must not act on any portion of a signaling message that contains errors. A malformed or erroneous message could be sent by the signaling partner and be properly hashed for integrity.
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