MS15-122: Security Update for Kerberos to Address Security Feature Bypass (3105256)

medium Nessus Plugin ID 86828
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VPR Score: 4.8

Synopsis

The remote Windows host is affected by a security feature bypass vulnerability.

Description

The remote Windows host is affected by a security feature bypass vulnerability in Kerberos due to a failure to check the password change of a user signing into a workstation. A remote attacker can exploit this vulnerability by connecting a workstation to a malicious Kerberos Key Distribution Center (KDC), resulting in the ability to decrypt drives protected by BitLocker.

Note that this vulnerability can only be exploited if the target system has BitLocker enabled without a PIN or USB key, and the computer is domain-joined.

Solution

Microsoft has released a set of patches for Windows Vista, 2008, 7, 2008 R2, 8, RT, 2012, 8.1, RT 8.1, 2012 R2, and 10.

See Also

https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2015/ms15-122

https://support.microsoft.com/en-us/help/3101246/ms15-122-description-of-the-security-update-for-windows-kerberos-novem

Plugin Details

Severity: Medium

ID: 86828

File Name: smb_nt_ms15-122.nasl

Version: 1.10

Type: local

Agent: windows

Published: 11/10/2015

Updated: 11/20/2019

Dependencies: smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

Risk Factor: Medium

VPR Score: 4.8

CVSS Score Source: CVE-2015-6095

CVSS v2.0

Base Score: 4.9

Temporal Score: 3.6

Vector: AV:L/AC:L/Au:N/C:N/I:C/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2015

Vulnerability Publication Date: 11/10/2015

Reference Information

CVE: CVE-2015-6095

BID: 77475

MSFT: MS15-122

MSKB: 3101246, 3105213, 3105211

IAVA: 2015-A-0278