Published:2014/11/21  Last Updated:2014/12/04

BSD Operating Systems vulnerable to denial-of-service (DoS)


BSD operating systems contain a denial-of-service (DoS) vulnerability.

Products Affected

Operating systems that implement the BSD IP stack based on Net/2 are affected by this vulnerability.

FreeBSD version 5.4 has been confirmed to be vulnerable.


BSD operating systems contain an issue in the handling of the TCP session timer, which may lead to a denial-of-service (DoS) vulnerability.


When a sepcially crafted packet from a malicious server is received, a condition where client resources are not released may occur. As a result, clients using an OS listed under "Affected Systems" may be vulnerable to a denial-of-service (DoS) attack.


Apply an Update
Update to the latest version according to the information provided by the OS developer or distributor.

Vendor Status

Vendor Status Last Update Vendor Notes
B.U.G. MORI SEIKI CO., LTD. Not Vulnerable 2014/11/21
BUFFALO INC. Not Vulnerable 2014/12/04
Cybozu, Inc. Not Vulnerable 2014/11/21
NEC Corporation Not Vulnerable 2014/11/21
Vendor Link
The FreeBSD Project FreeBSD
The NetBSD Project NetBSD
The OpenBSD Project OpenBSD


JPCERT/CC Addendum

This JVN publication was delayed to 2014/11/21 after developer fixes were developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2014.11.21 (CVSS Base Metrics)

What is CVSS?

Measures Severity Description
Access Vector(AV) Local (L) Adjacent Network (A) Network (N) A vulnerability exploitable with network access means the vulnerable software is bound to the network stack and the attacker does not require local network access or local access. Such a vulnerability is often termed "remotely exploitable".
Access Complexity(AC) High (H) Medium (M) Low (L) The access conditions are somewhat specialized.
Authentication(Au) Multiple (M) Single (S) None (N) Authentication is not required to exploit the vulnerability.
Confidentiality Impact(C) None (N) Partial (P) Complete (C) There is no impact to the confidentiality of the system.
Integrity Impact(I) None (N) Partial (P) Complete (C) There is no impact to the integrity of the system.
Availability Impact(A) None (N) Partial (P) Complete (C) There is reduced performance or interruptions in resource availability.

Base Score:4.3


Hiroki Takakura reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2014-7250
JVN iPedia JVNDB-2014-000134

Update History

B.U.G. MORI SEIKI CO., LTD. update status
Fixed spelling of name under "Credit"
BUFFALO INC. update status