Microsoft Windows OpenType Font input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

A vulnerability classified as critical has been found in Microsoft Windows (Operating System) (the affected version is unknown). This affects an unknown code of the component OpenType Font. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 on 64-bit platforms does not properly validate pointers during the parsing of OpenType (aka OTF) fonts, which allows remote attackers to execute arbitrary code via a crafted font file, aka "Win32k OTF Validation Vulnerability."

The weakness was published 06/14/2011 with KoroSoft as MS11-041 as confirmed bulletin (Technet). The advisory is shared at microsoft.com. This vulnerability is uniquely identified as CVE-2011-1873 since 05/04/2011. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 55121 (MS11-041: Vulnerability in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (2525694)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l.

Upgrading eliminates this vulnerability. Applying the patch MS11-041 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11955.

The vulnerability is also documented in the databases at X-Force (67732) and Tenable (55121). Similar entries are available at 4362, 4364, 4361 and 4367.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
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CVSSv2info

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Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 55121
Nessus Name: MS11-041: Vulnerability in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (2525694)
Nessus File: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
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Patch: MS11-041
TippingPoint: 🔍

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Timelineinfo

05/04/2011 🔍
06/14/2011 +41 days 🔍
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06/15/2011 +1 days 🔍
06/15/2011 +0 days 🔍
06/16/2011 +1 days 🔍
06/20/2011 +4 days 🔍
03/19/2021 +3560 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS11-041
Organization: KoroSoft
Status: Confirmed

CVE: CVE-2011-1873 (🔍)
OVAL: 🔍

X-Force: 67732 - Microsoft Windows Win32k OTF code execution, High Risk
SecurityTracker: 1025638 - Windows Kernel Memory Corruption Error in Win32k.sys Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 31774 - [MS11-041] Microsoft Windows Remote Arbitrary Code Execution Vulnerability via a Crafted OTF File, Critical
SecurityFocus: 48183 - Microsoft Windows 'win32k.sys' OpenType Font Parsing Remote Code Execution Vulnerability
Secunia: 44893 - Microsoft Windows OpenType Font Pointer Validation Vulnerability, Highly Critical

See also: 🔍

Entryinfo

Created: 06/20/2011 02:00
Updated: 03/19/2021 11:14
Changes: 06/20/2011 02:00 (83), 03/24/2017 07:54 (13), 03/19/2021 11:14 (3)
Complete: 🔍

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