Microsoft Windows up to XP Kernel pprFlattenRec PATHREC 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.
7.0	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Microsoft Windows up to XP. It has been classified as critical. Impacted is the function win32k!EPATHOBJ::pprFlattenRec of the component Kernel. Performing a manipulation of the argument PATHREC results in privileges management. The attack requires a local approach. Moreover, an exploit is present. This vulnerability has a historic impact because of its background and how it was received. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft Windows up to XP (Operating System). This affects the function win32k!EPATHOBJ::pprFlattenRec of the component Kernel. The manipulation of the argument PATHREC 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 disclosed 05/17/2013 by Tavis Ormandy (@taviso) with Google Security Team as exploitation ideas under memory pressure as not defined mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. The public release happened without involvement of Microsoft. The mailinglist post contains:

List, there's a pretty obvious bug in win32k!EPATHOBJ::pprFlattenRec where the PATHREC object returned by win32k!EPATHOBJ::newpathrec doesn't initialise the next list pointer. The bug is really nice, but exploitation when allocations start failing is tricky.

An attack has to be approached locally. The requirement for exploitation is a authentication. Technical details and a public exploit are known. 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 T1068 for this issue. Due to its background and reception, this vulnerability has a historic impact.

A public exploit has been developed by progrmboy in ANSI C and been published 3 weeks after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The advisory illustrates:

There's a public solution now, here's my version. Thanks to progrmboy for an exploitation idea he came up with that hadn't occurred to me.

Upgrading eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Operating System

Vendor

Microsoft

Name

Windows

Version

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

Screenshot

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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
Author: progrmboy
Programming Language: 🔍
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: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

05/17/2013 🔍
06/03/2013 +16 days 🔍
06/04/2013 +1 days 🔍
08/19/2018 +1902 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: exploitation ideas under memory pressure
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Not defined

GCVE (VulDB): GCVE-100-8937
scip Labs: https://www.scip.ch/en/?labs.20140213

Entryinfo

Created: 06/04/2013 18:12
Updated: 08/19/2018 20:02
Changes: 06/04/2013 18:12 (61), 08/19/2018 20:02 (2)
Complete: 🔍
Cache ID: 216:006:103