Microsoft Windows 8.1 ahcache.sys AhcVerifyAdminContext privileges management

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.
7.1	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Microsoft Windows 8.1. Affected is the function AhcVerifyAdminContext of the file ahcache.sys. The manipulation results in privileges management. The attack is only possible with local access. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in Microsoft Windows 8.1 (Operating System). It has been classified as critical. Affected is the function AhcVerifyAdminContext of the file ahcache.sys. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 01/01/2015 by James Forshaw as File 129786 (Packetstorm). The advisory is shared for download at packetstormsecurity.com. The exploitability is told to be easy. The attack needs to be approached locally. The successful exploitation needs a authentication. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

After immediately, there has been an exploit disclosed. The exploit is shared for download at code.google.com. It is declared as proof-of-concept. 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.

The vulnerability is also documented in the databases at X-Force (99639), Exploit-DB (35661), SecurityFocus (BID 71857†) and OSVDB (116497†). Entry connected to this vulnerability is available at VDB-68591. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 8.1

License

• commercial

Support

• end of life (old version)

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.1

VulDB Base Score: 7.8
VulDB Temp Score: 7.1
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: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

12/29/2014 🔍
01/01/2015 +3 days 🔍
01/01/2015 +0 days 🔍
01/01/2015 +0 days 🔍
01/07/2015 +6 days 🔍
01/07/2015 +0 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: File 129786
Researcher: James Forshaw
Status: Not defined

GCVE (VulDB): GCVE-100-68496
X-Force: 99639 - Microsoft Windows ahcache.sys privilege escalation, High Risk
SecurityFocus: 71857 - Microsoft Windows 'AhcVerifyAdminContext' Function Local Privilege Escalation Vulnerability
OSVDB: 116497

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

Entryinfo

Created: 01/07/2015 12:11
Changes: 01/07/2015 12:11 (59)
Complete: 🔍
Cache ID: 216:B0D:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

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