Microsoft Windows 7 up to XP Kernel pprFlattenRec PATHREC privileges management

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7.0$0-$5k0.00

A vulnerability classified as critical has been found in Microsoft Windows 7 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 privilege escalation vulnerability. CWE is classifying the issue as CWE-269. 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). 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. It is declared as proof-of-concept. The exploit is shared for download at seclists.org. 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.

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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: 🔍

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VulDB Base Score: 🔍
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-269
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: progrmboy
Programming Language: 🔍
Download: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: seclists.org

Timelineinfoedit

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

Sourcesinfoedit

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

Advisory: exploitation ideas under memory pressure
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Not defined
scip Labs: https://www.scip.ch/en/?labs.20140213

Entryinfoedit

Created: 06/04/2013 06:12 PM
Updated: 08/19/2018 08:02 PM
Changes: (2) software_type vulnerability_cwe
Complete: 🔍

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