CAPEC-495

UDP Fragmentation
Draft
2014-06-23
00h00 +00:00
2019-04-04
00h00 +00:00
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Descriptions du CAPEC

An attacker may execute a UDP Fragmentation attack against a target server in an attempt to consume resources such as bandwidth and CPU. IP fragmentation occurs when an IP datagram is larger than the MTU of the route the datagram has to traverse. Typically the attacker will use large UDP packets over 1500 bytes of data which forces fragmentation as ethernet MTU is 1500 bytes. This attack is a variation on a typical UDP flood but it enables more network bandwidth to be consumed with fewer packets. Additionally it has the potential to consume server CPU resources and fill memory buffers associated with the processing and reassembling of fragmented packets.

Informations du CAPEC

Conditions préalables

This type of an attack requires the attacker to be able to generate fragmented IP traffic containing crafted data.

Atténuations

This attack may be mitigated by changing default cache sizes to be larger at the OS level. Additionally rules can be enforced to prune the cache with shorter timeouts for packet reassembly as the cache nears capacity.

Faiblesses connexes

CWE-ID Nom de la faiblesse

CWE-770

Allocation of Resources Without Limits or Throttling
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

CWE-404

Improper Resource Shutdown or Release
The product does not release or incorrectly releases a resource before it is made available for re-use.

Références

REF-424

Fragmentation Considered Vulnerable
Yossi Gilad, Amir Herzberg.
http://u.cs.biu.ac.il/~herzbea/security/12-03%20fragmentation.pdf

Soumission

Nom Organisation Date Date de publication
CAPEC Content Team The MITRE Corporation 2014-06-23 +00:00

Modifications

Nom Organisation Date Commentaire
CAPEC Content Team The MITRE Corporation 2019-04-04 +00:00 Updated Related_Weaknesses