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freebsdFreeBSD0C064C43-600A-11E6-A6C3-14DAE9D210B8
HistoryJul 21, 2015 - 12:00 a.m.

FreeBSD -- Resource exhaustion due to sessions stuck in LAST_ACK state

2015-07-2100:00:00
vuxml.freebsd.org
29

CVSS2

7.1

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:N/A:C

EPSS

0.023

Percentile

89.8%

Problem Description:
TCP connections transitioning to the LAST_ACK state can
become permanently stuck due to mishandling of protocol
state in certain situations, which in turn can lead to
accumulated consumption and eventual exhaustion of system
resources, such as mbufs and sockets.
Impact:
An attacker who can repeatedly establish TCP connections
to a victim system (for instance, a Web server) could create
many TCP connections that are stuck in LAST_ACK state and
cause resource exhaustion, resulting in a denial of service
condition. This may also happen in normal operation where
no intentional attack is conducted, but an attacker who can
send specifically crafted packets can trigger this more
reliably.

OSVersionArchitecturePackageVersionFilename
FreeBSDanynoarchfreebsd-kernel= 10.1UNKNOWN
FreeBSDanynoarchfreebsd-kernel< 10.1_15UNKNOWN

CVSS2

7.1

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:N/A:C

EPSS

0.023

Percentile

89.8%