CVE-2016-9938 : Détail

CVE-2016-9938

5.3
/
Moyen
A01-Broken Access Control
1.42%V4
Network
2016-12-12
20h00 +00:00
2017-07-26
07h57 +00:00
CVE.org
NVD
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Descriptions du CVE

An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-285 Improper Authorization
The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.0 5.3 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Low

Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is constrained. The data modification does not have a direct, serious impact on the impacted component.

Availability Impact

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

None

There is no impact to availability within the impacted component.

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 5 AV:N/AC:L/Au:N/C:N/I:P/A:N 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

Products Mentioned

Configuraton 0

Digium>>Asterisk >> Version 11.0.0

Digium>>Asterisk >> Version 11.0.0

Digium>>Asterisk >> Version 11.0.0

Digium>>Asterisk >> Version 11.0.0

Digium>>Asterisk >> Version 11.0.0

Digium>>Asterisk >> Version 11.0.1

Digium>>Asterisk >> Version 11.0.2

Digium>>Asterisk >> Version 11.1.0

Digium>>Asterisk >> Version 11.1.0

Digium>>Asterisk >> Version 11.1.0

Digium>>Asterisk >> Version 11.1.1

Digium>>Asterisk >> Version 11.1.2

Digium>>Asterisk >> Version 11.2.0

Digium>>Asterisk >> Version 11.2.0

Digium>>Asterisk >> Version 11.2.0

    Digium>>Asterisk >> Version 11.2.1

    Digium>>Asterisk >> Version 11.2.2

    Digium>>Asterisk >> Version 11.3.0

    Digium>>Asterisk >> Version 11.4.0

    Digium>>Asterisk >> Version 11.5.0

    Digium>>Asterisk >> Version 11.5.1

    Digium>>Asterisk >> Version 11.6.0

    Digium>>Asterisk >> Version 11.6.1

    Digium>>Asterisk >> Version 11.7.0

    Digium>>Asterisk >> Version 11.8.0

    Digium>>Asterisk >> Version 11.8.1

    Digium>>Asterisk >> Version 11.9.0

    Digium>>Asterisk >> Version 11.10.0

    Digium>>Asterisk >> Version 11.10.1

    Digium>>Asterisk >> Version 11.10.2

    Digium>>Asterisk >> Version 11.11.0

    Digium>>Asterisk >> Version 11.12.0

    Digium>>Asterisk >> Version 11.12.1

    Digium>>Asterisk >> Version 11.13.0

    Digium>>Asterisk >> Version 11.13.1

    Digium>>Asterisk >> Version 11.14.0

    Digium>>Asterisk >> Version 11.14.1

    Digium>>Asterisk >> Version 11.14.2

    Digium>>Asterisk >> Version 11.15.0

    Digium>>Asterisk >> Version 11.15.1

    Digium>>Asterisk >> Version 11.16.0

    Digium>>Asterisk >> Version 11.17.0

    Digium>>Asterisk >> Version 11.17.1

    Digium>>Asterisk >> Version 11.18.0

    Digium>>Asterisk >> Version 11.19.0

    Digium>>Asterisk >> Version 11.20.0

    Digium>>Asterisk >> Version 11.21.0

    Digium>>Asterisk >> Version 11.21.1

    Digium>>Asterisk >> Version 11.21.2

    Digium>>Asterisk >> Version 11.22.0

    Digium>>Asterisk >> Version 11.22.0

    Digium>>Asterisk >> Version 11.23.0

    Digium>>Asterisk >> Version 11.23.0

    Digium>>Asterisk >> Version 11.23.1

    Digium>>Asterisk >> Version 11.24.0

    Digium>>Asterisk >> Version 11.24.1

    Digium>>Asterisk >> Version 11.25.0

    Digium>>Asterisk >> Version 13.0.0

    Digium>>Asterisk >> Version 13.0.0

    Digium>>Asterisk >> Version 13.0.0

    Digium>>Asterisk >> Version 13.0.0

    Digium>>Asterisk >> Version 13.0.1

    Digium>>Asterisk >> Version 13.0.2

    Digium>>Asterisk >> Version 13.1.0

    Digium>>Asterisk >> Version 13.1.1

    Digium>>Asterisk >> Version 13.2.0

    Digium>>Asterisk >> Version 13.2.1

    Digium>>Asterisk >> Version 13.3.0

    Digium>>Asterisk >> Version 13.3.1

    Digium>>Asterisk >> Version 13.3.2

    Digium>>Asterisk >> Version 13.4.0

    Digium>>Asterisk >> Version 13.5.0

    Digium>>Asterisk >> Version 13.6.0

    Digium>>Asterisk >> Version 13.7.0

    Digium>>Asterisk >> Version 13.7.1

    Digium>>Asterisk >> Version 13.7.2

    Digium>>Asterisk >> Version 13.8.0

    Digium>>Asterisk >> Version 13.8.0

    Digium>>Asterisk >> Version 13.8.1

    Digium>>Asterisk >> Version 13.8.2

    Digium>>Asterisk >> Version 13.9.0

    Digium>>Asterisk >> Version 13.9.1

    Digium>>Asterisk >> Version 13.10.0

    Digium>>Asterisk >> Version 13.10.0

    Digium>>Asterisk >> Version 13.11.0

    Digium>>Asterisk >> Version 13.11.1

    Digium>>Asterisk >> Version 13.11.2

    Digium>>Asterisk >> Version 13.12.0

    Digium>>Asterisk >> Version 13.12.1

    Digium>>Asterisk >> Version 13.12.2

    Digium>>Asterisk >> Version 13.13.0

    Digium>>Asterisk >> Version 14.0.0

    Digium>>Asterisk >> Version 14.0.0

    Digium>>Asterisk >> Version 14.0.0

    Digium>>Asterisk >> Version 14.0.0

    Digium>>Asterisk >> Version 14.0.0

    Digium>>Asterisk >> Version 14.0.1

    Digium>>Asterisk >> Version 14.0.2

    Digium>>Asterisk >> Version 14.1.0

    Digium>>Asterisk >> Version 14.1.1

    Digium>>Asterisk >> Version 14.1.2

    Digium>>Asterisk >> Version 14.2.0

    Configuraton 0

    Digium>>Certified_asterisk >> Version 11.0.0

    Digium>>Certified_asterisk >> Version 11.0.0

    Digium>>Certified_asterisk >> Version 11.0.0

    Digium>>Certified_asterisk >> Version 11.1.0

    Digium>>Certified_asterisk >> Version 11.1.0

    Digium>>Certified_asterisk >> Version 11.1.0

    Digium>>Certified_asterisk >> Version 11.1.0

    Digium>>Certified_asterisk >> Version 11.2.0

    Digium>>Certified_asterisk >> Version 11.2.0

      Digium>>Certified_asterisk >> Version 11.2.0

        Digium>>Certified_asterisk >> Version 11.3.0

        Digium>>Certified_asterisk >> Version 11.3.0

        Digium>>Certified_asterisk >> Version 11.3.0

        Digium>>Certified_asterisk >> Version 11.4.0

        Digium>>Certified_asterisk >> Version 11.4.0

        Digium>>Certified_asterisk >> Version 11.4.0

        Digium>>Certified_asterisk >> Version 11.4.0

        Digium>>Certified_asterisk >> Version 11.5.0

        Digium>>Certified_asterisk >> Version 11.5.0

        Digium>>Certified_asterisk >> Version 11.5.0

        Digium>>Certified_asterisk >> Version 11.6

        Digium>>Certified_asterisk >> Version 11.6

        Digium>>Certified_asterisk >> Version 11.6

        Digium>>Certified_asterisk >> Version 11.6

        Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

          Digium>>Certified_asterisk >> Version 11.6

            Digium>>Certified_asterisk >> Version 11.6.0

            Digium>>Certified_asterisk >> Version 11.6.0

            Digium>>Certified_asterisk >> Version 11.6.0

            Digium>>Certified_asterisk >> Version 11.6.0

            Références

            http://www.securityfocus.com/bid/94789
            Tags : vdb-entry, x_refsource_BID
            http://www.securitytracker.com/id/1037408
            Tags : vdb-entry, x_refsource_SECTRACK