English
Français
Light
Dark
System

CVEFind - Alertes CVE

Restez informé en continue
Créer un compte Ouvrez un compte Simple et Gratuit Se connecter Gérez vos alertes

CVE-2016-3237 : Détail

CVE-2016-3237

7.5
/
HIGH
A01-Broken Access Control
9.47%V3
Network
2016-08-09 19:00 +00:00
2018-10-12 17:57 +00:00
CVE.org
NVD

Alerte pour un CVE

Restez informé de toutes modifications pour un CVE spécifique.
Gestion des alertes

Descriptions

Kerberos in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607 allows man-in-the-middle attackers to bypass authentication via vectors related to a fallback to NTLM authentication during a domain account password change, aka "Kerberos Security Feature Bypass Vulnerability."

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-264 Category : Permissions, Privileges, and Access Controls
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

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

High

A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected.

Privileges Required

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

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

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.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

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

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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

 [email protected]
V2 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P [email protected]

EPSS

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

EPSS Score

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.

EPSS Percentile

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 : 40409

Date de publication : 2016-09-21 22:00 +00:00
Auteur : Nabeel Ahmed
EDB Vérifié : Yes

# Exploit Title: Kerberos Security Feature Bypass Vulnerability (Kerberos to NTLM Fallback) # Date: 22-09-2016 # Exploit Author: Nabeel Ahmed # Tested on: Windows 7 Professional (x32/x64) and Windows 10 x64 # CVE : CVE-2016-3237 # Category: Local Exploits & Privilege Escalation SPECIAL CONFIG: Standard Domain Member configuration with password caching enabled (default), BitLocker enabled without PIN or USB key. REPRODUCE: Prerequisites: - Standard Windows 7/10 Fully patched (up until 08/08/2016) and member of an existing domain. - BitLocker enabled without PIN or USB key. - Password Caching enabled - Victim has cached credentials stored on the system from previous logon. This vulnerability has a similar attack path as MS15-122 and MS16-014 but bypasses the published remediation. STEP 1: Obtain physical access to a desktop or laptop with the above configuration. STEP 2: Boot system and determine FQDN of the device. (example. CLIENT.domain.local), this can be obtained by monitoring the network broadcast communication, which the system sends prior to loggin in. The username can be extracted from the loginscreen (E.g USER1) STEP 3: Create Active Directory for the domain you obtained in STEP 2 (domain.local). STEP 4: Create User with similar name as the previously logged in user. (E.g domain\USER1), and force user to change password upon next login. STEP 5: Login on the target machine and proceed to the change login screen. STEP 6: Disable the following (Inbound) Firewall Rules: - Kerberos Key Distribution Center - PCR (TCP and UDP) - Kerberos Key Distribution Center (TCP and UDP) STEP 7: Change the password. (Changing Password screen will appear to hang) STEP 8: Wait 1 minute before re-enabling the firewall rules defined in STEP 6 STEP 9: Enable firewall rules again and after a few seconds the password should be successfully changed. STEP 10: Message "Your Password has been changed" is displayed, followed by the following error message "The trust relationship between this workstation and the primary domain failed." STEP 11: Disconnect Target system's network connection. STEP 12: Login with the new changed password. IMPACT: Access gained to the information stored to the target system without previous knowledge of password or any other information. This could also be used to elevate your privileges to local Administrator. Reference: Video PoC/Demo can be found here: https://www.youtube.com/watch?v=4vbmBrKRZGA Reference: Vulnerability discovered by Nabeel Ahmed (@NabeelAhmedBE) of Dimension Data (https://www.dimensiondata.com)

Products Mentioned

Configuraton 0

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version -

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_vista >> Version -

References

http://www.securityfocus.com/bid/92290
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1036576
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/40409/
Tags : exploit, x_refsource_EXPLOIT-DB

Plus d'informations
Cliquez sur le bouton à gauche (OFF), pour autoriser l'inscription de cookie améliorant les fonctionnalités du site. Cliquez sur le bouton à gauche (Tout accepter), pour ne plus autoriser l'inscription de cookie améliorant les fonctionnalités du site.