Microsoft Windows up to XP MS-CHAP V2 Authentication missing encryption

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.
6.0	$0-$5k	0.00

A vulnerability was found in Microsoft Windows up to XP (Operating System). It has been rated as critical. This issue affects some unknown functionality of the component MS-CHAP V2 Authentication. The manipulation with an unknown input leads to a missing encryption vulnerability. Using CWE to declare the problem leads to CWE-311. The product does not encrypt sensitive or critical information before storage or transmission. Impacted is confidentiality, and integrity.

The weakness was shared 07/29/2012 by Moxie Marlinspike as 2743314 as confirmed talk (Conference) via Defcon. The advisory is shared at computerworld.com. The public release happened without involvement of Microsoft. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/19/2018). MITRE ATT&CK project uses the attack technique T1600 for this issue. Due to its background and reception, this vulnerability has a historic impact.

After immediately, there has been an exploit disclosed. The exploit is available at github.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

Upgrading to version 2744850 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting Enable PEAP (Protected Extensible Authentication Protocol). The best possible mitigation is suggested to be the change of configuration settings.

support.microsoft.com is providing further details.

Productinfo

Type

Operating System

Vendor

Microsoft

Name

Windows

Version

License

commercial

Support

end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.5
VulDB Temp Score: 6.0
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: Missing encryption
CWE: CWE-311 / CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
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: Config
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: Windows 2744850
Config: Enable PEAP (Protected Extensible Authentication Protocol)

Timelineinfo

07/29/2012 🔍
07/29/2012 +0 days 🔍
08/20/2012 +22 days 🔍
08/22/2012 +1 days 🔍
08/30/2012 +8 days 🔍
08/19/2018 +2180 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: 2743314
Researcher: Moxie Marlinspike
Status: Confirmed
Confirmation: 🔍
OSVDB: 84912 - Microsoft MS-CHAP V2 Virtual Private Network (VPN) MitM Password Disclosure

scip Labs: https://www.scip.ch/en/?labs.20140213
Misc.: 🔍

Entryinfo

Created: 08/30/2012 17:48
Updated: 08/19/2018 20:02
Changes: 08/30/2012 17:48 (56), 08/19/2018 20:02 (2)
Complete: 🔍