CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6	$0-$5k	0.00

A vulnerability classified as problematic was found in Microsoft Windows up to 10/Server 2016 (Operating System). This vulnerability affects some unknown processing of the component Local Session Handler. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 03/17/2017 by Alexander Korznikov and gentilkiwi as 0-day or Feature? Privilege Escalation / Session Hijacking All Windows versions as confirmed advisory (Blog). The advisory is shared for download at korznikov.com. The public release happened without coordination with the vendor. The advisory contains:

@gentilkiwi has found that before in 2011, so that is a feature and not zero-day: http://blog.gentilkiwi.com/securite/vol-de-session-rdp

The attack can be initiated remotely. Required for exploitation is a single authentication. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

A privileged user, which can gain command execution with NT AUTHORITY/SYSTEM rights can hijack any currently logged in user's session, without any knowledge about his credentials. Terminal Services session can be either in connected or disconnected state. (…) Some bank employee have access to billing system, and it's credentials to login. One day, he come to work, logging in to the billing system and start to work. At lunch time he will lock his workstation, and out to lunch. Then, system administrator gets to employee's workstation, and logs in with his administrator's account. According to the bank's policy, administrator's account should not have access to the billing system, but with couple of built-in commands in windows, this system administrator will hijack employee's desktop which he leaved locked. From now, sysadmin can perform malicious actions in billing system as billing employee account.

A public exploit has been developed by Alexander Korznikov and been published immediately after the advisory. It is possible to download the exploit at korznikov.com. It is declared as functional. As 0-day the estimated underground price was around $25k-$100k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Additional details are provided at zdnet.com.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 7
• 8
• 8.1
• 10
• Server 2013
• Server 2016
• Vista
• XP

License

• commercial

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

Video

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.7
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Functional
Author: Alexander Korznikov
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

03/17/2017 🔍
03/17/2017 +0 days 🔍
03/19/2017 +2 days 🔍
08/19/2020 +1249 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: 0-day or Feature? Privilege Escalation / Session Hijacking All Windows versions
Researcher: Alexander Korznikov, gentilkiwi
Status: Confirmed
scip Labs: https://www.scip.ch/en/?labs.20161215
Misc.: 🔍

Entryinfo

Created: 03/19/2017 07:45
Updated: 08/19/2020 16:15
Changes: 03/19/2017 07:45 (52), 08/19/2020 16:15 (2)
Complete: 🔍

Discussion

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