CVE-2015-1417

Related Files

FreeBSD Security Advisory - TCP Reassembly Resource Exhaustion

Posted Jul 28, 2015

Authored by Patrick Kelsey | Site security.freebsd.org

FreeBSD Security Advisory - There is a mistake with the introduction of VNET, which converted the global limit on the number of segments that could belong to reassembly queues into a per-VNET limit. Because mbufs are allocated from a global pool, in the presence of a sufficient number of VNETs, the total number of mbufs attached to reassembly queues can grow to the total number of mbufs in the system, at which point all network traffic would cease. An attacker who can establish concurrent TCP connections across a sufficient number of VNETs and manipulate the inbound packet streams such that the maximum number of mbufs are enqueued on each reassembly queue can cause mbuf cluster exhaustion on the target system, resulting in a Denial of Service condition. As the default per-VNET limit on the number of segments that can belong to reassembly queues is 1/16 of the total number of mbuf clusters in the system, only systems that have 16 or more VNET instances are vulnerable.

tags | advisory, denial of service, tcp

systems | freebsd

advisories | CVE-2015-1417

SHA-256 | 4651dfbd0c91abc16de434dacb94a6bbd086b3657240c2386bbf868ee0921266

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