| GEN:SID | 1:521 |
| Message | MISC Large UDP Packet |
| Summary | This event is generated when an overly large UDP packet is observed.
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| Impact | Possible denial of service. UDP packet payloads are typically smaller than 4000 bytes. One possible explanation of a payload of greater than 4000 bytes is an attempted denial of service.
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| Detailed Information | UDP payloads are typically smaller than 4000 bytes since the UDP protocol is intended to be used for the transmission of smaller payloads. When a large payload is observed, it may be a sign or anomalous activity, perhaps an attempted denial of service against the remote host.
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| Affected Systems | Any system that listens for a UDP service.
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| Attack Scenarios | An attacker may craft large UDP payloads in an attempt to cause a denial of service against a remote host.
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| Ease of Attack | Simple.
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| Corrective Action | Allow only known UDP protocols inbound.
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| Additional References | Arachnids: http://www.whitehats.com/info/IDS521
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| Rule References | arachnids: 247
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