Escalation of privileges in Kerberos and NetLogon implementation in Microsoft Windows
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2016-3237 CVE-2016-3300 |
| CWE-ID | CWE-255 |
| Exploitation vector | Local network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system Windows RT Operating systems & Components / Operating system |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Kerberos privilege escalation
EUVDB-ID: #VU293
Risk: Medium
CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-3237
CWE-ID:
CWE-255 - Credentials Management
Exploit availability: Yes
DescriptionThe vulnerability allows an attacker with access to local network to gain elevated privileges.
The vulnerability exists in Kerberos implementation when handling password change request. A local attacker can make the operating system to fall back to NT LAN Manager (NTLM) Authentication Protocol as the default authentication protocol.
Successful exploitation of this vulnerability will allow a local attacker to launch a man-in-the-middle (MiTM) attack against the traffic passing between a domain controller and the target machine, intercept and decrypt credentials during password change request.
Vulnerable software versionsWindows: 7 - Vista
Windows Server: 2008 - 2012 R2
External linkshttp://technet.microsoft.com/en-us/library/security/ms16-101.aspx
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Netlogon privilege escalation
EUVDB-ID: #VU292
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-3300
CWE-ID:
CWE-255 - Credentials Management
Exploit availability: No
DescriptionThe vulnerability allows a local user gain elevated privileges on vulnerable system.
The vulnerability exists due to Windows Netlogon service incorrectly handles secure communication to a domain controller. A local attacker can run arbitrary code on the vulnerable system with elevated privileges.
Successful exploitation of this vulnerability will allow a local user to elevate privileges on the system, joined to Windows Server 2012 or Windows Server 2012 R2 domain controller.
Vulnerable software versionsWindows RT: 8.1 - 8.1 RT
Windows Server: 2012 - 2012 R2
External linkshttp://technet.microsoft.com/en-us/library/security/ms16-101.aspx
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
